Fuel pump not coming on?

Tiny
JIMINI
  • MEMBER
  • 1999 FORD F-150
Fuel pump isn't working. I think the pump is located in the tank, so I'm not looking forward to having to replace it. I'm hoping you will tell me it's just a blown fuse or relay or some other easy fix.
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Sunday, February 15th, 2009 AT 8:24 PM

14 Replies

Tiny
2CEXPT
  • EXPERT
You got the basic idea how it suppose to work-now if the fuse and relay turns out good-power the fuel pump directly from the battery and see what happen if it comes on check the fuel pressure-pressure okay could be an injector/s not pulsing.

Now if it still don't have power when you turn key to run-check the computer fuel pump relay controlled circuit
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Sunday, February 15th, 2009 AT 8:33 PM
Tiny
RKLUG
  • MEMBER
  • 1998 FORD F-150
  • V8
  • 4WD
  • AUTOMATIC
  • 145,000 MILES
The truck is not getting fire to the coil, there is no fuel pressure. Was driving vehicle, it stalled, unable to recrank. The above description is what I have learned. Put a hand held diagnostic on it and it would "read" then show "error".
Thanks
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Thursday, September 10th, 2020 AT 10:51 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • EXPERT
If you lost both spark and fuel I want you to check the EEC relay under the hood. It is in the relay block. Switch it with another relay in the box with the same part number. Let me know if it changes anything.

Joe
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Thursday, September 10th, 2020 AT 10:51 AM (Merged)
Tiny
RKLUG
  • MEMBER
Thanks Joe,
I have checked all relays as you suggested along with the fuses. If I did it correctly, the horn relay and the eec relay have the same parts number. The horn worked and I pluged it into the eec relay. The horn no longer worked but, was still not getting fire or fuel.
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Thursday, September 10th, 2020 AT 10:51 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • EXPERT
With the key in the run position, is there any power to the EEC relay?
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Thursday, September 10th, 2020 AT 10:51 AM (Merged)
Tiny
RKLUG
  • MEMBER
Yes sir there is power
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Thursday, September 10th, 2020 AT 10:51 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • EXPERT
It sounds like a problem with the automatic shutdown relay. I have searched my resoruces and can't find its location on a 98.
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Thursday, September 10th, 2020 AT 10:51 AM (Merged)
Tiny
RKLUG
  • MEMBER
Could it be the PCM?
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Thursday, September 10th, 2020 AT 10:51 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • EXPERT
Yes.
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Thursday, September 10th, 2020 AT 10:51 AM (Merged)
Tiny
COWGIRLUP974
  • MEMBER
  • 1996 FORD F-150
  • V8
  • 4WD
  • AUTOMATIC
  • 125,000 MILES
I am trying to find out how you till a fule pump is not working. You can not hear it turn on when you trun the key on. When you try to strat the truck it wont trun over. We have looked for the intrunal turn off swich but we can not find it. We need help.
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Thursday, September 10th, 2020 AT 10:51 AM (Merged)
Tiny
2CEXPT
  • EXPERT
The inertia fuel cut off switch is located behind the right kick panel
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Thursday, September 10th, 2020 AT 10:51 AM (Merged)
Tiny
BLUELIGHTNIN6
  • EXPERT
Also check the relay. Relay number 2 in your power distribution box in your engine compartment. Swap it out with another relay that is same size. If this enables the pump to turn on, you just need to replace the fuel pump relay.

Hope this helped.
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Thursday, September 10th, 2020 AT 10:51 AM (Merged)
Tiny
R85EDWARDS
  • MEMBER
  • 1994 FORD F-150
  • 5.0L
  • V8
  • 4WD
  • MANUAL
  • 200,000 MILES
My truck listed above has dual tanks. Fuel pumps not running and used a test light to check for power. I had a very dim light and fuel tank connections. Checked inertia switch and tank selector and had no power, fuel relay was not pulling in but had power on terminal 30. I can jumper pin 6 at test port and pumps will run.
I am not sure what tells the ECM to close and ground the other side of the fuel relay.
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Thursday, September 10th, 2020 AT 10:51 AM (Merged)
Tiny
ASEMASTER6371
  • EXPERT
Good evening,

The control side of the relay gets power from the power relay. That is the relay right next to the fuel pump relay. The ground is the ECM. It will run the pump for 2 seconds and then turn them on full while cranking and running.

Roy
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Thursday, September 10th, 2020 AT 10:51 AM (Merged)

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