No power to fuel pump relay. There is no power going into that or out.

No power to fuel pump relay The c/opn relay is what turns on the pump. You can verify by looking for ground at pin 4 of the fuel pump relay. Fuel Pump Fuse 22 is good 4. There is no power going into that or out. traced fuel pump wires under the truck, through the cab and under the dash. Jul 25, 2010 · No matter what I tried in the fuse/relay box (the guy who designed the early model 944 relay box is not my friend today) I could not get the fuel pump activated. There are different reasons why the fuel pump relay fails. The CEL flashes rapidly, but I don't get any OBD-1 messages when I check. 12V 898229Kickdown. Search Fixya. Even tested the relays. 5 and newer 944s is essentially the same as the fuel pump relay used on early 944s. SOURCE: 94 buick century 3. A power failure is preventing pump from operating. Try powering the fuel pump with B+ from the battery positive terminal with a jumper wire to see if the pump runs. If thats good check the terminal on the relay for the ground. It's adjacent to the fuel pump relay. 2L, the truck ran great then was parked for about a year went to fire it up and the fuel pump wouldnt work, put in a new pump, cleaned every ground wire on the truck, new relay and another computer from the scrap yard, pump kicks in if i put power to the test cicuit under the hood and also if i put power to the wire in the relay harness Nov 4, 2023 · 1999 - 2003 7. That is terminal #5 and feeds the load (fuel pump). I have read many threads and cannot find what I'm looking for. My connector is a 16 pin with only 4 wires, one is the Power Wire (red) to Pin 16. Time to test for voltage upstream. You might get the engine to crank when you turn the motor, but since there is no So no codes/ faults, tacho does full sweep all lights come on. I did this two ways. Nov 20, 2014 · The car has never done this until recently. Pull the wire and the truck dies (fuel pump stops) Bummer. put it in dealer mode but no code There will be no "vigorous clicking" a fuel pump or circuit opening relay (note word order there is no 'open circuit' relay, there is a 'circuit opening' relay). My question: I have read of TIPM issues with the fuel pump relay. Any idea where it gets it's power Jan 8, 2014 · 2008 Yukon no power to fuel pump It has a FPCM not a relay. From what I read, there are far fewer problems with the crankshaft position sensor than there are with the K40 Yes, power flows through the fuel pump relay. Ford has the fuel pump circuit go through several connections under the master cylinder area. We have seen that when this important component fails it interrupts the flow of I have removed the k40 twicw to double check. It has 7 terminals. I did some research and jumped the Jun 12, 2020 · Hello, I am using a 2000 PCM with an interior harness/BCM that's either a 99 or a 01-02 (there were a couple of wires that didn't line up with the 2000 service manual so I don't think it's a 2000 body harness). Make sure it's good, and do some reading about it, it's a fairly common easy to fix problem, and can cause no power at the fuel pump relay if it goes bad. Want to jump Fuel Pump relay by B+ and Fp on diagnostic connector, but cannot find which pins correspond. I have the exact same symptoms-No voltage at the fuel pump. After maybe 5 minutes it died. The fuel pump relay not engaging issue is often caused by loose To diagnose no power to fuel pump, pull out the fuel pump relay from its socket and use other relays of the same rating in place of the fuel pump relay to confirm whether the fuel pump relay Symptoms of a Bad Fuel Pump Relay. I swapped the EFI relay with a relay of the same type, as well as the circuit open and fuel pump relays. Learned that one the hard way too. No juice whatsoever. Browse Categories NO POWER GOES FROM RELAY TO PUMP ,HAVE FOUND PROBLEMS WITH FUEL PUMP WIRERING PLUG IN. I can crank the bike but no start. I can supply fuel pump with voltage Oct 29, 2023 · It is a friend of mine's work van, and it needed a lot of TLC. Checked and replaced the engine cutoff/fuel pump relay. Feb 23, 2024 · Keep your fuel tank at least a quarter full: Running your vehicle with a low fuel level can cause the fuel pump to work harder than necessary, leading to premature failure of the fuel Jun 17, 2022 · The Fuel pump relay then sends power to the actual fuel pump, which draws fuel from the fuel tank and sends it to the engine for the combustion process to start. I went farther back and found the relay. There is however no fuel being pumped to the injection system. This relay is located on the circuit board of the TIPM. Relay is good (also tried a jumper between 30 and 87) 3. The fuel sending Aug 8, 2011 · You should have power to two wires of the relay when the pump should be running. However, figuring out the exact culprit is tricky, so let’s start with the easiest one. Attachments. 2. (Tested-it was dead) Replaced fuel pump. That fuse could be bad and the fuse holder itself could be bad. If you do not disable the fuel pump, the ECU will open the injectors every time you cycle the ignition and supply excessive fuel to the intake manifold. If that tests okay, then check to see if power is going into it while ignition is in the start position. The relay turns on, but no whirling of the fuel pumps. FUEL PUMP RELAY When the ignition switch is in either the START or RUN positions, it connects circuit A1 from fuse 3 in the Power Distribution Center (PDC) to circuit A21. Following SM trouble shooting leaves me with a dead end as testing the battery side of the relays shows the fuel pump relay has no power going into it. I checked the fuel pump relay with a 12V supply and can feel it throw. Main relay will then supply power to the fuel pump relay. -Kalim M3 drive train conversion (S54 Swap, LSD, 6MT, suspension linkage) | UUC Stg 2 Organic Clutch | OEM M-Tech II Kit Almost all the time, people Feb 17, 2010 · The fuel pump relay supplies power to fuse 23 and the e-box fan. No blown fuses. Oct 27, 2012 · Cannot get power to fuel pump. No sign of anything on the 5 relay board. If thats good get a long piece of wire that you know works and connect it to the positive wire at the fuel pump. Everything else looks ok but no idea if there's a Hidden fuel pump relay or fuse. I have confirmed power to the 15 and 30 pins on the fuel pump relay (the relay is new). There does not seem to be any power supply for the pump to run at the relay. New to this forum but not new to forums. No power going out of pin 8 of PCM to fuel pump relay. 1L replaced The fuel pump relay is twice fused. My post #22 bypasses the fuses and relay. I tested the +12V wire in the connector to the fuel pump. No power. New Fuel Pump (runs when I put 12 V to it). The fuses - GMC 2008 Yukon question. When manually activated there is still no power to the fuel pump. All other fuses I can see on the left side are good. The excessive current flow can overwhelm the fuse, causing it to blow and interrupt the power supply to the fuel pump relay. Checked Oct 10, 2002 · The first thing I tested was the actual blue power wire running from the fuel relay/resistor to the fuel pump. Check the relay socket for the ONLY terminal that faces differently from the other three. Next, pull your fuel pump relay (between the two firewalls and in about the center of the car) and place a jumper wire between sockets 7 and 8. twisting the pins on the relay will work sometimes for a short time. The most common sign of a failed fuel pump relay is a car that refuses to start, even though the engine cranks when you If your fuel pump isn’t receiving power, start by checking the fuel pump relay and fuse for any signs of damage or malfunction. You can hear the fuel pump prime occasionally (but only does it once and does not do it if you cycle the key again) has a Sp I got the no power to the fuel pump issue the other day. 40a fuse ok. The relay power is provided through a fusible link connected at the starter post that the positive battery cable connects to; and there is an in-line fuse inside a cube shaped plastic box near the relay. One of those connections was corroded and caused an issue. Ignition off Simplified Fuel pump wiring: 15A engine fuse powers the main relay when ignition on. The FPDM requires a specific PWM signal from the ECU to send power to the pump. Will be rechecking all connections. I replaced the coil, plugs, wires fuel filter, cap and rotor. Test the power supply to the fuel pump using a multimeter to ensure the voltage is reaching Understanding why your fuel pump relay is not getting power is crucial for diagnosing and resolving this issue effectively. The fuel control plunger and/or the air sensing plate is stuck in the raised position and the air flow switch is I have an 84 928 S that won't start. Replaced the fuel pump relay with a known working on, and jumped the relay position using 15 and 87, still no prime at fuel pump. Therefore, the problem lies in the fuel pump / DME relay, the DME computer, Mar 13, 2005 · 1987 - 1996 F150 & Larger F-Series Trucks - 1988 F150 No power to fuel pump - I own a 1988 F150 that suddenly quit working. I checked the fuel pump fuse and relay and both are working. 5l cranks but won't start. The fuel control plunger and/or the air sensing plate is stuck in the raised position and the air flow switch is Jun 13, 2021 · I‘be no idea what car you have but modern fuel pump circuits fool many people. Aug 24, 2021 · I replaced the fuel pump and I've bench tested the pump to be working. Per the 05-07 manual: fuel pump, which pressurizes the system for start-up. I would first verify that the main EFI, fuel pump, and ignition fuses are not blown, as these can sometimes cut off power to the fuel system. Ran last year and now I have no power to the fuel pump. please bear with me. There is no power getting to the fuel pump fuse located next to the battery. I turned the ignition key over to the running position, where the car Oct 25, 2021 · I checked the fuel pump relay and it seems all right cuz I switched it with the horn relay still no power, so I jumped the 87 pin because it's getting full power to a number 30 pin and it showed no power! I hope you did not change the fuel pump just because it's missing the 12V feed at pin 30 of fuel pump relay. Wiring Diagram in a 94 (same for 95) from EVTM, partial; from Maxi Fuse U in Power Distribution Box (PDB) through PCM Power Relay Coil & Maxi Fuse O in PDB through FP Relay to Inertia Fuel Cut-Off Switch (IFS) May 22, 2009 · fist off the truck is a 95 s10 2. Make sure you check the fuel pump fuse when the engine is cranking. Then take the other end and check for continuity between the spare wire and the fuel pump relay terminal that sends power to the fuel pump. When I turned on the ignition, I got power to the lights and starter relay, but no sound from the fuel pump relay and no prime from the fuel pump. Turns over, does start if I hit it with ether. This relay actually checks out ok. 4(rebuilt to almost a 6l) 4x4 auto. 2001, QCSB, 2500, auto, 3:54gears, 4in down Jan 27, 2025 · Using a voltmeter, I tested for voltage on the wire that powers the pump under the truck. Apr 20, 2024 · Something is preventing the electrical circuit from closing, which is a function of the relay. To manually enable the Fuel pump relay, ground the Tan/Light May 2, 2010 · With stand alone wires w/ clips, connect the fuel pump directly to the battery or another power source and see if the fuel pump "whines" on it's own when you complete the circuit. Circuit A21 feeds circuit F12 through fuse 11 in the fuse block. will start checking the wires. According to the Mar 10, 2011 · That fuse provides power on the coil side of the fuel pump relay. 2008 Jan 25, 2010 · That power comes from the fuse. . Jul 10, 2007 · There is no power at the inertia switch. No luck. I jumped power straight to the 87 pin, and then got full power to the pump so that part of the system is ok. Oh, forgot something. Using a volt meter I checked the voltage to the relay using the diagnostic port along side the relay, and got . So if you are not getting power to the fuel pump relay it may be the main relay. Checked voltage at PCM supply and getting 12 volts. From what I understand the ECU provides the signal to engage the pump? I had this same problem, and then when I traced for power there was no power to the fuel pump/relay/fuse It turned out to be the inline fuse in the positive cable. I have an 84 928 S that won't start. You would've saved some time and money and people would know where to direct you next. The fuel pump fuse is good, but I've discovered it's not getting 12V with the Jul 15, 2022 · Maybe it’s the same. Pump is working. " Maybe if I read your user name better I would have known you had an 84! Has no power at Fuel pump relay. Fixing any of these issues isn’t difficult at all, but nevertheless, we will explain it. I have tried finding Sep 30, 2004 · No power to the fuel pump. There is power getting to the fuses but not getting back to the pump. Your best bet is a new wire harness for the Fuel pump went out. Also NB1's have a not so great grounding from the factory. 348 volts continuous when the key is on. Ive replaced the fuel pump with a known working one, still does not prime or get power. I know for a fact that my new fuel pump is working. Wires go to a relay (circled in green). Has constant power to pin 87 and ground at pin 86. Dec 8, 2007 · 83 380SL no power to fuel pump? Jump to Latest On my 1983 380SL the "Electronic Fuel Pump Relay" is located behind the glove compartment box. When the van came to me, they were using a relay with a piece of plastic tied around it to keep the contact closed. No 12 volt for 2 seconds at all, but a continuous . From what I understand the ECU provides the signal to engage the pump? The fuel pump relay gets power directly from the battery via the smaller red wire off the battery terminal. Car is back together, reinstalled the fuel pump relay but the pump isn't kicking on. The pump then stops and only restarts when the engine fires - the ECU signals the pump to restart. I dont remeber witch wires but one will be hot from the battery/key power the other signal from ecm. Everything seems to work, except the fuel pump relay. I have replaced both Fuel Pump Relay and Circuit Opening Relay. Got it towed and such and heres whats going on now. Apr 24, 2013 · The fuel pump relay doesn’t actually turn on the fuel pump. You have to test it while cranking (not just KOEO). The fuel pump relay gives the fuel pump power when it is time to build up fuel pressure in the Aug 4, 2011 · Ok fuse has power I didn't hook the meter up right. See more Loose Connections. Aug 14, 2012 · Completely died, power was still on but it was no longer running. No matter what I tried in the fuse/relay box (the guy who designed the early model 944 relay box is not my friend today) I could not get the fuel pump activated. View Profile View Forum Posts Member Join Date Sep 2018 Ultra Limited. Used a test light and nope, no power at the connection to the fuel pump. The relay coil has power and comes on. Works when hot ran straight from bat. Help please? Save Share replaced the relay,,,no joy. I'm looking for thoughts. The fuel pump relay is a crucial component that controls the electrical circuit supplying power to the fuel pump. Oct 14, 2022 · I'm getting a "crank but no start" condition. It will not necessarily have power when you just turn the key to the "on" position. It's only active while cranking or the engine is running. There is no power either (obviously) at the connection of the fuel pump at the tank end. Circuit A141 powers the fuel pump motor (part of the in-tank fuel pump module). Fuse in regular dash fuse panel is good. I replaced the fuel pump, but now realize that I'm not getting power to it. Dec 31, 2022 · Remove the fuel pump relay or fuse anytime you want to cycle the ignition power multiple times while you work on something else that doesn't need fuel psi to work on. That will really suck. Fixes: Replacing the relay should allow the engine to start normally. Nov 27, 2023 · Learn about the fuel pump relay fuse, its importance in the fuel system, signs of a faulty fuse, common causes of failure, testing and troubleshooting methods, how to replace it, and preventive maintenance tips. Feb 27, 2023 · The fuel pump relay is an important component of the fuel system of your vehicle. I can supply fuel pump with voltage Next thing to check is the main DME relay, which supplies power to the fuel pump relay. Oct 9, 2019 · With regard to 1987 GM TBI, once the engine builds >5± PSI while cranking, the OPS contacts close and supply power directly to the fuel pump, bypassing the fuel pump relay. You might also like to read: 5 Reasons And Fixes For Jan 31, 2021 · 230k miles on original wp so I put a gates kit in it, I pulled the fuel pump relay before bumping the starter to break the crank bolt free. Tested the relay using multimeter. Tested new pump. Car starts when I put gas in the intake. 1) Car Won’t Start. I also Jumped out the EEC plug to make the fuel pumps run constant. Voltage meter shows no power getting to the fuel pump. -87 XJ 4. In this comprehensive guide, we will explore Whenever you turn on the ignition of your vehicle, the fuel pump relay is turned on. Still no fuel. My issue is there is no power going to the fuel pump relay. Bad relay - no circuit - no power. The relay will not close to allow power to the 87 pin and on to the pump. Swapped out Jan 23, 2022 · Checked all fuses and relays. 0 5spd, 2"BB, 31" BFG ATs on 15x8 Eagle 058s, trimmed and doorless When Mar 4, 2010 · There are 2 relays controlling the fuel pump: One is EFI relay located in the fuse box near the battery; Second one is Circuit opening relay located near the engine computer (as mentioned by above posters) If your CHECK engine light is not on, check the EFI 15A fuse, located next to the relay Feb 27, 2008 · The relay power wire (pink) is HIGH AMP so if the connection is just a bit loose, it would cause the fuel pump to not energize. There is Oct 2, 2022 · The Powertrain Control Module (PCM) provides ground for the relay on circuit K31. When the PCM grounds the fuel pump relay, contacts inside the relay close and connect circuit A61 from fuse 16 in the PDC to circuit A141. It's labelled 5500/min8Zyl. There is an inline fuse near the relay. If you there is no power to the fuel pump or the relay, then there may be a possible electrical issue with the vehicle. I removed the glove compartment box for easier access, but one could probably reach up behind the glove compartment area and pull it Feb 14, 2015 · Battery (duh) -> ECU master relay (219, in the ECU box) -> fuel pump relay -> fuel pump fuse -> fuel pump. Circuit F12 powers the coil side of the fuel pump relay. Voltage at the fuel pump connector with F and B+ jumpered should be at/near battery voltage (normally 12. Rarely driven, but the problem is that 9 out of 10 tries, the fuel pump gets no power so the car wont start. 3. Learn about the fuel pump relay fuse, its importance in the fuel system, signs of a faulty fuse, common causes of failure, testing and troubleshooting methods, how to replace it, and preventive maintenance tips. The 15a fuses are ok. Dec 30, 2022 · It lets the ECU know that the fuel pump relay is engaged and that the injectors have power. Replaced both fuses in the box, put in new fuel pump/filter. 12-29-2010, 03:27 AM #6. Oct 31, 2017 · That is, since the relay supplies power to the pump, you need to determine if the relay is getting power but not sending it on to the pump because 1) the relay is not flipping, or because 2) the power's not getting from the relay to the pump (ie, a Apr 21, 2019 · I tested the relay, and it tested OK. Feb 9, 2023 · Crank but no start. i bet there are a LOT "The DME relay which is used on 1985. The ECM switches off the pump preventing the continued delivery of fuel in these instances: • If the key switch is not promptly turned to the "start" position. you might consider popping the cover off and cleaning the contacts with fine sandpaper. Nov 26, 2012 · 1997 - 2003 F150 - No Power to Fuel Pump Relay - HEllo all. I have a 1997 F250 LD 5. If I apply power manually the fuel pump turns on. If you have removed the fuel pump relay, jumpered power across it's relay socket and the fuel pump does not receive power - you have a wiring issue. Jun 29, 2018 · 01' R6 with no power to the fuel pump, when Carbs are gravity fed = bike runs. There is no power coming in on the Nov 5, 2012 · No power to fuel pump relay HELP! Good news: I can start the truck by hot wiring a wire from the positive battery terminal to the hot side of the fuel pump relay. Assuming no other gremlins exist the engine will still start, but after many more seconds of cranking. No changes. Jun 4, 2020 · I believe the power is supplied via the pdm for five seconds and then the stator takes over. When you turn on the ignition -the fuel pump runs for a timed period to prime /pressurise the delivery system. The fuel pump relay is the electronic component found A bad fuel pump relay will not relay the required electrical power to the fuel pump, which in turn does not deliver the designated amount of fuel to the engine. #Ad. The car has been behaving erratically for a while now. In this article, I will discuss the Failure: An utterly failed fuel pump relay won’t be able to send power to the fuel pump, preventing the engine from starting. 4 Faulty Fuel Pump Relay. Helpful 0 ; Nov 21, 2010 · The fuel pump is under control of the ECM (engine computer) and if the ECM is not 100% happy with all of its inputs like from the camshaft or crankshaft position sensors, it will disable the ASD relay which disables the fuel pump relay. 3L Power Stroke Diesel - No power to fuel pump - Not a long story, but a fair amount of background. 5L 460HP. Sweet. Reply With Quote. I swapped out another relay just to be sure (used my horn relay) and still got nothing. If you're not getting power, the DME probably isn't grounding the relay. You can double-verify the terminal number by checking it from underneath the relay. Pump comes on, truck fires right up. The fuel pump relay sends power through the resistor or direct depending on if it’s energized or not. so the coil can be bad and the pumps can run. What reasons would keep the PCM from turning on the fuel pump relay. Im not getting any power to my fuel pumps(the inline and the one in the tank) I have checked the fuses and changed the relay and still have no luck. Replaced the battery, now no power to the fuel pump. Started the truck up. Oct 16, 2020 · Voltage meter shows no power getting to the fuel pump. After replacing the left side bank of plugs, the truck would crank but not run. Troubleshooting and Replacing Fuel Pump The fuel pump can malfunction due to several reasons, one of which is the lesser-known issues with the fuel pump relay. Replaced fuel pump, still no power to pump (not hearing pump prime). You the yellow relay runs the pump in the de-energized mode. Oct 30, 2016 · Hello. Its in the trunk about a foot from the terminal. the 12V for the FPDM comes through fuse 27 and the fuel pump relay. Eg, last one activated the horn noise! There is no power to the K1 relay for the fuel pump. Remove the fuel pump relay. This should force the fuel pumps to run Jul 7, 2011 · 1987 - 1996 F150 & Larger F-Series Trucks - 1988 Ford F-250 No power to fuel pumps - I have a 88 ford f-250 4X4 with the 7. Sep 16, 2014 · This goes to the fuel pump relay. Aug 9, 2006 · If the fuel pump starts, it indicates that the fuel pump, power supply to the fuel pump, and wiring from the relay panel to the fuel pump are good. 348 volts. I turned the ignition key over to the running position, where the car The EEC (also described as PCM) Power Relay provides power to the EEC-IV processor and the control side of the fuel pump relay. Was letting it idle in the driveway. I have metered from the fuel pump relay back thru the inertia switch and have determined that there is continuity. Then there are 3 wires, white with black stripe to Pin 4, Black I have removed the k40 twicw to double check. One was to run a long piece of wire from the fuel pump end of the power wire to the relay/resistor Has no power at Fuel pump relay. txtorquemade. I replaced the fuel pump relay hoping that was the problem. It can also cause sudden death, as if it were a bad crankshaft position sensor. If the fuel pump relay energizes when the key is turned to the "ON" position - 1. Mar 21, 2017 · 1987 - 1996 F150 & Larger F-Series Trucks - Power to the fuel pump relay, no power to the pumps - My 90 F250 with 7. I've also incorporated the LSx steering column so I do have the VATS. If it does, the fuel pump and relay are ok. The OPS is just a failsafe in the event of fuel pump relay failure. There is spark present. 1. The c/opn relay sends power to the fuel pump relay. I have the van running smooth and no more black smoke, you can drive it, but the problem I'm having now is power to the fuel pump through the relay. When you look at the fuse box, do you notice another relay that is the same as the fuel pump relay? If so, switch the relays to see if the new relay activated the fuel pump. On the DME relay, the socket for pin #30 should read 12v at all times, and pin #85 should have 12v when you're When you turn the key on the Fuel Pump relay gets 12volts and a Ground from computer for 2 seconds, then the computer stops grounding the relay, it will ground relay again Ok fuse has power I didn't hook the meter up right. I have checked the fuse and relay, both good. Fuse is good, just no power to the lines whether key is in on position or not. Circuit K31 connects to cavity C19 of the PCM. Wiring to fuel pump confirmed good Fuel pump relay (brown) confirmed functional Main relay (white) works as it should Is there something that can disable the fuel pump, part of the security system or something? Jun 30, 2013 · There is no power getting to the fuel pump relay at all. May 30, 2017 · If you have removed the fuel pump relay, jumpered power across it's relay socket and the fuel pump does not receive power - you have a wiring issue. The fuel pump relay on the early cars is located on the fuse / relay panel under the dash on the driver's side (LHD). Double checked it and it's getting power. Extra info> When I turn the ignition key on the relay clicks on. Tested the fuel pump by hooking up directly to the battery and its good. iripb oxcz gie qdile ppelsb qzjwuh sqkyss hds shmgcrn ymg