Can A Fuel Pump Relay Work Intermittently

it was a mane ground at night it would get wet and not ground. 4L LD9 With 3rd Party After Market Vehicle Key Fob Required Security System Spliced In Up And Behind Drivers Side Lower Dash. Ok can narrow it down by probing your Fitech fuse on the fuel pump Orange wire when you turn the key on for prime. I put my ear on the fuel pump when it's running and it sounds smooth and quiet not like it's grinding and going bad. The fuel pump relay is designed to last the life of the car, but due to the grueling conditions it is exposed to, it will not usually last that long. I think I can hear the fuel pump making noise inside the tank. Jun 30, 2013 · We tried everything but the fuel pump for a couple days. the second time the connector pin and socket came loose inside the plug itself,( workes for a while then dosen't). Loose or corroded wiring connections in the pump circuit, a bad relay or low system voltage can all affect the operation of the fuel pump. Oct 09, 2018 · If it experiences 2 or 3 of these intermittent stalls in quick succession, then the engine can't recover and will completely stall. by Bob O'Neill and Bob Lincoln. Originally it was a bad fuel pump changed that then there was no pressure fixed that. Turn the key and may crank, release the key and all lights are on but will not crank. You can check to see if the recall was ever done. Can anyone suggest any ideas, or anyone experienced a similar problem. What ‘seemed’ to be happening was that the IPR would short on battery voltage, and would then work OK when the glows were pulling the extra amp load dropping voltage until the relay went open and the problem would return. TPI - Fuel pump and relay questions - So I've been trying to sell the Trans Am as is not running, but it's hard to sell a non running car as you can imagine. VW intermittent wiper relay. Suspect bad fuel pump relay because of intermittent problems…. Fuel Pressure Specification Is: 39-41 PSI With Key On Engine Off. I swapped the fuel pump relay and the adjacent wiper relay in the fuse block with no change in behavior. The next step is to verify that the fuel pump relay's high current circuit is being fed with battery power too. The main electrical no-fuel problem is the actual Fuel Pump Relay. The second Fuel Pump relay is where the ECU controls the timing of the fuel rail priming function and acts as a fuel cut-off control in addition to the Inertia Switch so is an important safety. So it can't be the two stage relay, assuming you even have one. Intermittent Fuel Pump Issues Please bear with me as this story is fairly long, but I'll try to keep it as short as possible. Does anyone know where the fuel pump relay is located on a 31 ft Winnebago Chieftain/John Deere chassis. We cater to lighting showrooms, lamp stores, antique shops, and funeral homes, as well as the do-it-yourselfer. You can check to see if it is the relay itself, by switching the main relay with the fuel pump relay next to it, and see if the fuse blows using that relay. When this wiper relay goes bad you may find that you have no control over the speed of your wipers, or they may not work at all. Oddly, though, when it would finally die and not idle anymore, the fuel pump was still running as I could hear it (Walbro 255, very audible when car is off), and the A/C WOT Relay would intermittently click every couple seconds, along with the fuel pump relay (and when this clicked, I could hear fuel pump momentarily shut off for the click). I bought the fuel pump relay on Amazon and installed it in the car, charged the battery and it fired up right away. No help with extended starting. Can get power by jumping fuel pump relay. So it's a no-brainer that a malfunctioning fuel pump is bad news. Fuel pressure is steady at 40psi Connected the bypass connector next to the fuse box under the hood to + power and it does make the Fuel Pump run continuously. I know that one is listed as PGM-FI Main Relay 1 and the other is called PGM-FI Main Relay 2 (fuel pump), but I am looking for more detail on how they work. Very distinctly with each intermittent stall, I can hear the fuel pump relay behind the glove box clicking. Jan 23, 2013 · Low fuel pressure on start/ intermittent starting. It all started few month ago when I noticed the cranking times too start up took a little longer. The fuel pressure changes with the output of the pump. Turn the key and may crank, release the key and all lights are on but will not crank. Engine bay box if it's the same as an NK 2big blocks at an angle next one down is the fuel pump fuse directly to the Right is the relay 2relays are the same try swapping them, on the fire wall is a black female plug wire has a white stripe take a wire from Post battery to that it's the fuel pump bypass and get someone to crank it as you do. Issue still exists. It is not very expensive and is easy to replace. simple thing to try - switch the horn relay with the fuel pump relay. my son has an 01 1500 Vulcan Nomad FI. : VP-44 / CP-3) is open and allowing fuel to return to the tank through this pump. CarComplaints. There are two fuel pump relays called J17 (449 on top) at position 2/2 under the dash which supplies the fuel pressurisation pump in the tank and J49 (449 on top) at position 1/1 under the dash which is fuel pump relay 2 and supplies fuel pump 2 in the engine bay. Remove the relay from the unit's wiring harness. As you see, power can get through the resistor if the two stage relay is stuck open and it can get through the relay if it is stuck closed. Also below the oil pressure switch on the back of the Ford 460 center at the top of the block is an item with 2 wires. Was wondering if it could be either the crankshaft or the camshaft position sensors. 2006 Searay 220 select with 350 Mag while under power the engine will cut off randomly but always fire back up. Most likely you are. Possible loose connection to the fuel pump /fuel pump relay or a possible faulty fuel pump relay. Most VW's have a 5 pin "cube" relay for the fuel pump, but this test will work with the 4 pin style as well. I can not find all the details at this moment but the following should help - the DME does control the fuel pump. Ok, I’ve seen this before, most likely we have a bad fuel pump. I changed the ECM Power relay and haven't had a problem since with the fuel pump not coming on. download 543 fuel pump secondary circuit fault free and unlimited. However your issue could be safety relay, side stand switch, fuel pump or ecu relays, either fuse under the seat and a few other possibles. So I hope that this fixed that issue. To check to see if the relay stuck closed, you can just turn the key on and let the pump run. theres a reason new quality fuel pump for these trucks come with an updated connector. but it is getting worst; The problem that I have is the car just don't start. There may be various reasons for a malfunctioning fuel pump. :7: FIXED! It just shows to go ya, engines are finnicky and like to fool ya if they can. Started and ran fine for a couple days. When the fuel pump starts going bad it can cause that relay to great up and close off. Is it possible for relay's to work intermittently as they go bad? I'm wandering if I should just buy a new relay to get that out of the equation. If you have the "Jumper" installed correctly on the fuse panel with the relay removed, then the fuel pump should run continuously. This is much safer but you'll have to acquire the pressure gauge, possibly a loaner from Autozone (call to ask if one is available) otherwise you may have to buy one. Oct 24, 2009 · Fuel pump relay is next to the battery, third relay down, to verify you have the right relay pull out the 5th relay down the horn should fail to work, label on underside of relay box cover identifies relays. com : Car complaints, car problems and defect information. Most VW's have a 5 pin "cube" relay for the fuel pump, but this test will work with the 4 pin style as well. An engine runs on fuel just like the heart of a human runs on oxygen and blood. I'd fix that first. Battery Fuse Panel Ignition Switch Light Switches; J4: 53: 1: S240: Dual Horn Relay: J5: 53: 4: E7/NL: Fog Light Relay: J17: 409: 4: S163: Fuel Pump Relay: Gasoline engine only. I hear one relay do a click and nothing so I ordered one, so maybe tap on fuel pump as well?. I'd of thought the fuel pump relay would only control that part and not include the radiator fans. I can't test the MAF unless I put in a known good relay or jump it and I'm not too sure yet what pins should jump (at the momemt I have the fuel pump hot wired not jumped) The relay I have is a 5 pin duel relay, Toyota have been telling me it's a special kind of relay, expensive and hard to find!. If the ECU won't turn on, it won't ground out the fuel pump relay. If the pump runs, then the relay is bad. Originally it was a bad fuel pump changed that then there was no pressure fixed that. Also, sometimes that corrosion builds up and prevents the relay from breaking contact. Suspect bad fuel pump relay because of intermittent problems with starting when engine warm. Re: Cub Cadet Volunteer fuel pump relay Here is a typical wiring diagram for a relay. Jun 26, 2006 · Saturday morning as I was leaving for work, I got the dreaded warning signs and the check engine light came on. Replaced the fuel filter, fuel pump, fuel pressure regulator, Ignition Control Module, plugs, wires, and fuel pump relay. Metered the Relay, has 12V. Fuel pressure is steady at 40psi Connected the bypass connector next to the fuse box under the hood to + power and it does make the Fuel Pump run continuously. I am sure somebody can help me out here, but how in the world would a "failing" fuel pump - either not pumping or pumping at less than robust - cause a rich condition and the smell of excess fuel. Jun 30, 2013 · We tried everything but the fuel pump for a couple days. Another way they can fail is the solder joints can fail. Usually a bad or failing fuel pump relay will produce a few symptoms that can alert the driver of the issues. Ok, I’ve seen this before, most likely we have a bad fuel pump. I'm finding info on the 3rd generation Tempo/Topaz (92-94), but nothing for the 2nd gen (88-91). It still would not run, sooooooooooo, I replaced the fuel filter, the fuel relay, oil relay, electronic control module, pick up coil, rotor, coil, distributor cap and the fuse under the dash. You may have to register before you can post: click the register link above to proceed. Normally when I hit the run switch I get a whine from the fuel pump that lasts 2-3 seconds and stops. by Bob O'Neill and Bob Lincoln. 1 day ago · engine stalls. its part of the pump relay circuit and part of the trouble shooting list for fuel problems in the gm service manual. There are 2 relays inside the fuel injection/pump relay. has been an intermittent problem for years, out of blue won't here injectors energize, can come out next day, cranks fime. It sends a ground signal to the fuel pump relay. ***Update*** This issue still happened after this video. Recall completed 4 years ago and issue came back about a year ago. I'm not really sure what I am having problems with, but I'll tell you the signs and symptoms and what I have checked and hopefully we can work through this. The RPM relay can be tested by removing it from the car and shorting pins 30 and 87 together. the part number is 4692139AA This is the item name: Accessory Power Relay. Rechecked fuses and all are good. Correction Procedure: Replace with known good unit. The Relay Is A Switch Unto Its Self. ok my fuel pump relay wont work, fuel pump good i jumped it an it work an car will shut off in mid drive then cut on,whats wrong. Next is failure of the OD wires just below the shifter,. An engine runs on fuel just like the heart of a human runs on oxygen and blood. There has been some fuel pump problems on many makes where the ethanol dosed fuel has some contaminant in it that binds up the pump. If the fuel pump relay has an issue while the vehicle is operating it will cut off power to the fuel pump, which will cause the engine to stall. Others can correct if I am mistaken. 6 INDUSTRIAL ENGINE S/N 66600001-UP From the library of Barrington Diesel Club Use the bookmarks for navigation inside of the Manual. Next is failure of the OD wires just below the shifter,. A car's fuel pump relay turns on the fuel pump when the motor runs. If car now starts and runs, take for road test. Sep 23, 2011 · Time for some basic troubleshooting, you will need a voltmeter to determine if the pump is getting power when this happens, then start working backwards, (check relay, connectors). I first need to find out however if 12V would be the correct voltage value at the Pump connector. I know that one is listed as PGM-FI Main Relay 1 and the other is called PGM-FI Main Relay 2 (fuel pump), but I am looking for more detail on how they work. I do not know what this relay is for and should I get a replacement as I can only assume I haven't had one since I bought the car a couple years ago used. The Bosch relay and the KAE Fuel Pump relay both click when the ignition is turned but there is no power getting to the main fuel pump (I have the in tank pump disconnected while troubleshooting). There should be continuous 12-volts regardless of key position. Fuel pump control module (only vehicles with demand controlled fuel pumps) The fuel pump control module powers the fuel pump and regulates the output of the pump. Just go buy 3 relays and see if it. fuel pump relay. Yes, a standard 30 amp relay should perform just as good. Update 20140120. Dec 02, 2014 · 1995 Ford Explorer/Ranger intermittent fuel pump issues. its part of the pump relay circuit and part of the trouble shooting list for fuel problems in the gm service manual. Finally figured out it was the fuel pump. Depending on the vehicle’s system, the fuel pump computer module may only monitor the resistance to ground, and then relay the fuel level information to the instrument panel. I think I can hear the fuel pump making noise inside the tank. This is much safer but you'll have to acquire the pressure gauge, possibly a loaner from Autozone (call to ask if one is available) otherwise you may have to buy one. There is a recall on the fuel pump sending unit for the first gens due to a corrosion problem in the harness connection. For vehicles that won't start (out of gas) or have a dead battery (fuel pump runs after turning vehicle off). Okay with the engine off testing the amps on the fuel pump relay It gets 0. Sep 23, 2011 · Time for some basic troubleshooting, you will need a voltmeter to determine if the pump is getting power when this happens, then start working backwards, (check relay, connectors). This further lead me to believe the relay was dead. The car has a problem starting, it sounds like the fuel is not flowing to the engine dough I can hear the pumps noise. Fuel pump did not cycle when I turned the key to the run position. In the case of an electric fan or a fuel pump, a small voltage signal would go from the computer to the relay. I found this relay but i'm not sure if it's the right one that I need to replace the faulty fuel pump relay from the recall for a 2011 Durango crew. May 10, 2018 · Now it is not working at all, I get an intermittent issue where the bike will not start. It is part of the control system of a fuel pump and its failure can lead to start up problems. You don't want the fuel pump to be running if the engine isn't turning over as that creates a fire hazard should you be in a crash. Checked and there was no power to pump. Among the most commonly damaged portions of the fuel pump relay are the coil and contact points. Tips for Diagnosing Fuel Delivery Problems by Tommy Samuels. Or you can borrow a relay from a relative's or friend's car. I think we have either a fuel pressure regulator issue (very rare) or an intermittent spark issue causing incomplete combustion. Will a fuel pump relay. Another clear sign of a bad fuel pump relay is a car that suddenly begins to slow down without any provocation from the driver. On some cars the fuel pump will prime and on others it doesn't. that cause it to not work properly. This is a safety feature; however, the relay can be replaced with a "no- rev" or "hi- rev" version so that the cut- off point is eliminated or increased to approximately 7500 rpm. An intermittent signal to the fuel pump relay can certainly cause misfires if brief enough not to completely stall the engine out. If you think there is no power to the pump, you might try the below suggestions on bypassing the fuel pump relay or "jumping" the pump to get power going to it again. Fuel pump relay or fuse or main relay (module) failures are common in some vehicles. The fuel pump relay controls power to the fuel pump, So, any faults with it can cause fuel pump issues. electric fuel pump relays can fail causing hard starting There are a zillion cars out there today that use the oil pressure sending unit as a dual function switch, the first function to send oil pressure information to the dash gauge or idiot light and the second function being to run the fuel pump after the car starts. If it does not, use 12 volt cordless drill (such as DeWalt or equivalent, 9 volt will work as well) for the further testing: 1. This type of solenoid can also be used for a variety of applications where a remote relay is needed to power a motor or other device. The repair shop still thinks I should bring the car in to have the starter diagnosed (for a $110 fee). So found relay behind radio, changed and still no power. com : Car complaints, car problems and defect information. Jan 01, 2013 · Fuel Pump Relay Location (Driver Side Kick Panel): You’ll see another blue and black relays next to it under driver side kick panel, it’s the one that has four black wires going to it; Simple test you can do before taking out the relay, is to hold it in your hand and turn the key into ON position without starting the car – if they relay. The relay contacts will glaze, and cause resistance lowering voltage to the ECM. Injecting power won't help in this situation. If both relay and pump are OK, then there is possibly a problem upstream, for example poor connection at engine ECU. Mar 10, 2010 · Diesel immobiliser is a fuel shut off valve in the Fuel pump. Yet the car will not start, there is fuel pressure to the rail. It rubs but the new relay is still warm. The problem has only occurred at start-up. If there's something wrong with the relay, you can expect the fuel pump to fail intermittently. A faulty fuel pump relay can cause the car to come to a complete stop while driving. The Relay Is Required To Make Your Electrical System Work For The Fuel Pump. 2006 Searay 220 select with 350 Mag while under power the engine will cut off randomly but always fire back up. Easiest thing to do is to remove them. Defective Fuel Pump Relay. A bad pump will also show signs of intermittent breakdown; it will work for around 15-20 minutes and then stop working. Decided to order another resistor and install it. Fuel Pump Relay Gets Power From Fuse #6 (15 Amp) and Fuse #15 (30 Amp) From the Power Distribution Center. crown vic pi 01. In some cases, the car is liable to stop entirely, leading to disastrous results. If I pull a relay, and the fuel pump does not run, it could be because it's that relay, or it could be that it's not that relay and the actual fuel pump relay is just malfunctioning again. simple thing to try - switch the horn relay with the fuel pump relay. I’m heading for work right now but if you PM me with an email address I can send you a wiring diagram in the morning. which is correct. I bought the fuel pump relay on Amazon and installed it in the car, charged the battery and it fired up right away. What your dealer will do FCA will repair your vehicle free of charge. if it only dies after a couple hours of running i doubt its a filter issue. By far, the easiest way to test a suspect fuel pump relay — or some other automotive relay — is to swap the suspect relay with a good one. The fuel pump's job is pretty self-explanatory: to pump fuel from the gas tank to the engine. The fuel pump relay is designed to last the life of the car, but due to the grueling conditions it is exposed to, it will not usually last that long. Home Team Talk. Very distinctly with each intermittent stall, I can hear the fuel pump relay behind the glove box clicking. ***Update*** This issue still happened after this video. Find our best fitting relay - fuel pumps for your vehicle and enjoy free next day delivery or same day pickup at a store near you!. They can also cayse stalling and/or starting problems. FIRST - are you 100$ sure its fuel? Get a can of starting fluid. Most common problem with the overdrive is due to the shift knob accidentally being pulled off of the shift lever (while trying to engage reverse), which results in the OD button wires being disconnected from the switch. Thus the fuel pump was just sucking air on hills or when the tank get low. A click should be felt and the main fuel pump under the car, beneath the drivers seat, should cycle for approximately 1. if it doesn't make sure the fuel pump relay is working, you can feel it click if your fingers on it. 1997 - 2003 Ford F150 - Where is the fuel pump relay located? - I have a 2002 F150 XLT Supercab 4. i replaced the fuel pump last year when the pump does not come there is no power to the pump wire harness at pump plug some times it takes a few trys to. I've read about people resoldering the joints and cleaning the contacts and making a relay live again. Can get power by jumping fuel pump relay. However, after couple tries, car started. For the relay, might want to pop down to the dealer and see what they're stocking. Powertrain Control Module Relay. I was there the whole time and saw nothing done that could cause this. Another way they can fail is the solder joints can fail. Not sure if any of this applies, but yeah it can happen. Dec 14, 2018 · You can also put the pump relay into another spot and test if the relay activates the other function. This is a safety feature; however, the relay can be replaced with a "no- rev" or "hi- rev" version so that the cut- off point is eliminated or increased to approximately 7500 rpm. If you are using wing nuts on the battery, that would allow the power and ground cables to have a loose connection and run hot, quickly / intermittently turning on and off the 12v power just enough for the ECM to see it. Get it replaced before you get stranded. If you're having trouble with your car intermittently stalling, having no-fuel or no start problems, or other associated problems, this repair service could be the answer for you. The dealer says the whole fuel tank needs to be replaced as well as the relay. If the original fuel pump relay +12 VDC signal is intermittent or not present (an indication it’s faulty), this green LED and power output to the fuel pump will mimic it. Jun 28, 2015 · he said the pressure at the pump is only going no higher than 35 psi, and no gas is getting to the engine. Sounds like you could still have an ECU issue. The real problem is the fuse box overheating and causing the relay to the fuel pump to not work once in a while. Another symptom is the fuel pump real stays on ( latched ) and kills the overnight (intermittent) same issue different symptom. You may find another relay in your car with the same configuration — arrangement and number of terminals — as your fuel pump relay. Seeing as how the relays were all replaced by the previous owner,I figured maybe the ground contact on the fuel pump relay port was bad so i ran a new ground wire from the existing. Now it won't start at all - just cranks. Other symptoms might include stalling out (as if vehicle suddenly ran out of gas despite plenty of fuel in tank). Apr 03, 2008 · Even so, whipping around a sharp corner, or braking or accelerating hard can sometimes starve the pump for fuel. The fuel pressure sensor used on PWM fuel pump systems can be located either on the fuel rail or under the vehicle near the fuel tank. If you have the "Jumper" installed correctly on the fuse panel with the relay removed, then the fuel pump should run continuously. I thought there was a fuel pump relay that. The IPDM relays can be intermittent. Possible loose connection to the fuel pump /fuel pump relay or a possible faulty fuel pump relay. Defective Fuel Pump Relay. and all you need to do is wire it to your ignition system. For the relay, might want to pop down to the dealer and see what they're stocking. Fuel pump relay or fuse or main relay (module) failures are common in some vehicles. IT IS NOT OK to use car with fixed feed to fuel pump. I t always goes through the start sequence thru HEAT. It still would not run, sooooooooooo, I replaced the fuel filter, the fuel relay, oil relay, electronic control module, pick up coil, rotor, coil, distributor cap and the fuse under the dash. If you're attentive, you can catch the symptoms of a failing fuel pump and have it repaired or replaced before it leaves you stranded on the side of the road. If the relay goes bad, it will not induce the pump to start functioning. It could be the fuel pump too, or an assortment of other problems, but it's worth checking the relay before looking at the fuel pump and other stuff. If I take out the relay and put it back in it works just fine until it hits a point and either causes the relay to stick open or just not allowing the fuel pump to work properly. Average repair cost is $110 at 97,400 miles. Also below the oil pressure switch on the back of the Ford 460 center at the top of the block is an item with 2 wires. my son has an 01 1500 Vulcan Nomad FI. You could go 10 miles down the road and then it would stop. If it does not, use 12 volt cordless drill (such as DeWalt or equivalent, 9 volt will work as well) for the further testing: 1. The fuel pump relay is designed to last the life of the car, but due to the grueling conditions it is exposed to, it will not usually last that long. I have ruled out the Passkey issue. Oct 24, 2009 · Fuel pump relay is next to the battery, third relay down, to verify you have the right relay pull out the 5th relay down the horn should fail to work, label on underside of relay box cover identifies relays. The fuel pump relay works as it should. If you don't feel comfortable doing this then use a fuel pressure gauge that can be attached to the schrader valve without spraying any fuel while using a jumper wire across the fuel pump relay. The regulator is a small valve with a spring-loaded diaphragm inside. It happens 3 to 4 times within 1 mile after Norma operating temp, then after that never occurs till the next cycle to work or home. Hi everybody, I need your help so bad!. Find our best fitting relay - fuel pumps for your vehicle and enjoy free next day delivery or same day pickup at a store near you!. Sep 23, 2011 · Time for some basic troubleshooting, you will need a voltmeter to determine if the pump is getting power when this happens, then start working backwards, (check relay, connectors). I have replaced that relay (it is the updated version) and I do not experience the loss in illumination of the glow plugs nor any engine failure due to ecm losing power. Find our best fitting relay - fuel pumps for your vehicle and enjoy free next day delivery or same day pickup at a store near you!. Is the fuel pump relay located in the maxi fuse box under the hood? If so, which one? Also, is there a difference between a fuel pump relay and a fuel pump fuse? If so what is the location of the fuse? Do I need to remove both? I have read the posts in the Lesabre and Park Avenue forums and I am still :confused:. The fuel pump relay is controlled by the central electronic module (CEM) at the request of the engine control module (ECM). If it's a bad fuel pump relay, this trick will NOT work because there will be no power going to your pump. I don't remember if it did that before or not. You can spend money to have someone else test your fuel pump relay, or you can test it yourself. When bad, the Programmed Fuel Injection main Relay or PGM-FI Main Relay usually causes an intermittent “crank no start” when warm. Push the ignition, I hear one single click, then the air & electronics all come on, but engine does not start. It has a thunder intake and I believe Cobra commander (not USB). Can't hear fuel pump kick in or that relays are working. try tapping on it a bit or banging on it, but before you do, let me tell you that you need a new fuel pump or the hose could have something in it blocking flow or something. i can turn the motor it will not start but if i just turn the key on and crank the motor on and off i hear a relay click and the fuel pump comes on and it starts. (put on exhaust gas analyser first with catalyst equipped vehicles). Not saying this is your issue but you may need a new fuel pump. I can use a "jumper-wire" to short the fuel pump relay (#87 to the #30) these are hot wires, the fuel pump will turn on even if the keys are out of the ignition. Get the job done with the right part, at the right price. Re: Intermittent fuel pump problem reversing polarity, instead of the bulb it's your pump, change the positions of the wires for you i think the relay are on the drivers side, lef side of the car, and there are 2 relays, not sure withc is for the pump, bridging means that you take out the relay an stick a short wire between pins witch the relay. Question is , COULD the ECM be controlling the relay to open or is this a pretty clear case of MFrelay failure, thanks for the feedback. The fuel pump feeds fuel to the engine at a reliable rate; without this pump, your fuel would just sit in your tank, useless and inert. I noticed as I was looking to get the part number that the fuel pump relay that is suppose to be above it is not there. Sometimes this will jar them loose so you can make it home. I swapped the fuel pump relay and the adjacent wiper relay in the fuse block with no change in behavior. 1994 Honda Accord Ex Main Relay Location? If this is your first visit, be sure to check out the FAQ by clicking the link above. ** I can't speak directly to the connector at the relay box in engine bay but in terms of the relays, a red constant positive "supply" wire connects to 30 of each relay (you should see battery voltage at each of those, engine off) and. Many BMWS are having problems with their high pressure fuel pumps, leading to check engine lights, stalling and other issues. I parked my bike and went inside for about 2 hours. Tachometric Relay: A Tachometric Relay is used on EFI powered cars to control the fuel pump. handy to know if your looking for a second hand pump from a scrap merchants as td4's can be of limited supply. The fuel pressure sensor used on PWM fuel pump systems can be located either on the fuel rail or under the vehicle near the fuel tank. which is correct. To do this, your dealer will install an external fuel pump relay. Fuel Pump and FI Relay Diagnostic Tests. If the ECU won't turn on, it won't ground out the fuel pump relay. i can turn the motor it will not start but if i just turn the key on and crank the motor on and off i hear a relay click and the fuel pump comes on and it starts. I t always goes through the start sequence thru HEAT. Beyotch fooled me to the tune of a $125 bucks. It's especially helpful when you're driving in light rain, at which instance you need a fully functioning wiper, but you need just a slight wipe every now and then-too much can cause sticking of the wipers on the glass. The Relay Is Required To Make Your Electrical System Work For The Fuel Pump. For example, your Honda Accord starts great in the morning, drive around town, stop a the grocery store or the gas station and the vehicle no longer starts up after a hot soak. you can jump the relay by taking a scrap piece of wire striping the ends and take take one end to the hot wire and one to the main wire that goes to the fuel pump. If the pump is failing while the car is running, then it is not likely to be a relay problem. Will try adding a additional earth to the fuel pump and report back. When the rpm reaches the built- in limit, the fuel pump relay shuts off the fuel pumps. has been an intermittent problem for years, out of blue won't here injectors energize, can come out next day, cranks fime. However your issue could be safety relay, side stand switch, fuel pump or ecu relays, either fuse under the seat and a few other possibles. I’m heading for work right now but if you PM me with an email address I can send you a wiring diagram in the morning. This sounds like a problem that Hondas have been often reported to have: a fuel pump relay (under the dash, near the steering column in Hondas) does not work esp. The fuel turns into varnish and the pump fails. My X series gauge (I think it is an 30-0300) will work fine, and then the next start-up, I get no AFR readings. I had to pull that wire and solder a new one on. I can not find all the details at this moment but the following should help - the DME does control the fuel pump. For the purpose of this question I would like to know how to eliminate the relay as the source of the problem. There are 2 relays inside the fuel injection/pump relay. Quick update. It wasn't until I located the relay under the hood with intentions of swapping it for the fan relay did I get it to run. Update 20140120. HA yeah id say that relay is gone----i further checked my fuel pump after i pulled it off the bike I put it on an independant power supply and had to crank it up to like 25 volts to get the pump to come alive---if you've jumpered the relay wires and still no pump sounds with the key on id say its bad---if you put your hand on the pump when you flip the key on can you feel it kind of chunk as. So far the new fuel pump relay has been working well and my car hasn't had an issue starting up. 28 on the relay and stays at 0. When it is going to have one of its episodes, the car starts, dies in about 1 second, then will not fire at all (cranks but no fire). However if the connector above is corroded, I would suspect some other connectors will be as well, and corroded connectors can cause intermittent faults. They once again determined that the fuel pump was bad and replaced the pump, so I asked if they checked the filter, tank, fuel, etc. In testing the fuel pump (powered the fuel pump @ the tank directly from the battery), it passed the tests (ohm meter (OK), runs when directly connected to battery) in the manual but I figured I'd see if it was pushing gas as well. So with the engine running, the relay should stay picked until the engine is turned off. Have the fuel pressure tested and if it is low, then it is the fuel pump. A friend who worked at a Ford dealer said that letting the fuel get really low causes the fuel pump to overheat because the fuel cools the pump inside the gas tank. 5 Diesel, or Buy a DS4 Injection Pump for 6. Jun 20, 2018 · The fuel pump relay would be energised by the ECU using a grounding signal, which is a separate system to the alternator and charging system, so I doubt they are rleated. $1100 to fix. If you are certain you had power to the pump when it would not pump then it can be a bad pump and do exactly what you had happen. With the help of this 'How To' tutorial, I'll show you how to do it using only a multimeter. It's especially helpful when you're driving in light rain, at which instance you need a fully functioning wiper, but you need just a slight wipe every now and then-too much can cause sticking of the wipers on the glass.