Question about 1988 Ford F 150

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1989 F-150 no power to fuel pumps , all new, Run out of ideas

I have taken out both pumps and tested themand are fine , the relays are fine but I have no poiwer to any of the fuel system...

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Have you checked your tank selector switch and its other componets

Posted on Jul 22, 2009

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The fuel pump is working fine, and the car runs fine, just after something gets hot somewhere the car shuts down, like no power


when dies check and feel the fuel pump relay if hot --replace with a same number relay from board to test or plug in a new one --and start --or check pump new doesnt mean free from defects it may be drawing excess amps and causing he relay to pop or pump to shut down

Sep 05, 2016 | 1994 Cadillac Fleetwood

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1988 Trooper fuel relay/fuel pump issue


do you have power to the relay when you turn the key if not try to run power from the battery to the relay and see if it activates

Jan 18, 2014 | Isuzu Trooper Cars & Trucks

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Gm Troubleshoot I have no fuel pressure with a replaced fuel pump, fuel filter, fuel pressure relief value, and a new oil pressure switch. When I replace the oil pressure switch the 2000 z71, 5.3L started...


Check the fuse and fuel relay. Relay is located in electrical center under the hood on the driver side. The relay and fuse legend will be on bottom side of the protective cover. You can test it by exchanging it with another relay that you know works, (horn relay, etc.).

With the key OFF, listen carefully for a slight whirring / buzzing sound for 5+ seconds or so when you turn the key to on / run. This sound is the fuel pump running. If you hear it run, then it is most likely pumping fuel - but is blocked somewhere (crushed line?). You could disconnect the fuel line to verify fuel delivery while the pump is running if you need to. If you don't hear it; check for 12V + and GROUND at the pump. Remember, the pump only runs for a few seconds when the key is in the run position with the engine NOT running, so power will be there for a few seconds only. Check for loose / poor (+) and ground lead connections as they can cause this problem too.

Good luck!

Sep 17, 2013 | Cars & Trucks

1 Answer

Why do i have to bypass my fuel pump relay


I look at the relay as two different circuits, the load side of relay is that line with arrowhead, when relay is energized that line moves to other terminal, you can see voltage to load side of relay comes from fusible link. That circuit goes through inertia switch, then to the pump. Then you have the control side of relay, left side in the diagram, that side has to have voltage and ground, voltage comes from eec power relay and that circuit is grounded by the pcm.
f150 fuel pump-zkue20ih5gqqvta5qpd2pmol-4-0.jpg

Mar 25, 2017 | 1988 Ford F 150

2 Answers

1994 buick park avenue . driving home and shut off


how did you jump the fuel pump relay, by bypassing the relay or by applying power to contact that closes the relay? If you bypassed the relay completely you need to b ench test the relay you can do this easily by using any 12v dc power source. If you tested the fuel pump relay by applying power to the relay and the pump run and developed pressure. I suspect a wiring or ground issue. Good luck

Oct 07, 2009 | 1997 Buick Park Avenue

1 Answer

Running fine then now wont start, fuel pump or will the fuel relay module cause the car to get no gas


More likely the fuel pump.........check for power to the pump on the gray wire at the fuel pump connector at the tank.(wires from the tank)You should see a prime cycle voltage as you turn the key on...if the key has been off 15 seconds. If you see a test light, light.......change the fuel pump.
Tip....a lot of relays are the same in the relay center....switch the fuel pump relay for one of the (same) others to test it if needed.

Before you do this....sit in the car and turn on the key to run.....not start.......do you hear the pump do it's prime cycle?
Total silence means.......in 99% of cases...a new fuel pump is needed.
If you hear it.......no pump should be needed....look elsewhere first.

Aug 10, 2009 | 1991 Oldsmobile Cutlass Supreme

1 Answer

2000 S10 4.3L Fuel pump stopped working out of the blue. We Put a new Fuel Pump in, new harnes to fuel pump, new fuel filter, new relay, new fuses in IGN C and ECM B fuses. Still the pump will not turn on....


Did you verify that the relay terminals have the appropriate signals to them? 

ECM fuse B (20-amp) should provide power at all times to the orange wire of the fuel pump relay. The relay coil receives ground via the black wire, and relay coil gets power from the dark green/white wire. When the relay is closed, you should have battery power on the gray wire. 

The relay trigger wire should have power from the dark green/white wire in terminal 1 of the Vehicle Control Module (VCM) connector for the first couple of seconds after they key is turned to run (to prime the system) and when the truck is running. Checking for all the appropriate signals at the relay is where I would start. That is after I checked for diagnostic codes.

Believe the fuel relay is the middle relay out of the three in the left rear of the glove box. Last thing is to hot wire the fuel pump if you can not get it scanned, see if the pump is bad unless your going to have a shop work on changing the fuel pump.
Good luck and hope this helps. keep me posted.

May 06, 2009 | 1999 GMC Safari

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