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1988Ford F150 Econoline Van5.0fuel system problems

Checked all fuses"replacedEcm andfuel pump relays,replaced both fuel pump units ,checked circit breaker no power on either side of circit put 12 volts to fuel pump circut all 3 pumps work no power to tank switch when you turn ignition switch on or in start position pumps dont prim up.What do I do next???????

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  • Cars & Trucks Master
  • 21,873 Answers

Not sure I am following your story, but here goes.
The fuel pump relay gets power from a fuseable link at the starter solenoid and from the EEC relay. When the fuel pump is grounded by the computer it sends power to the inertia switch then to the pumps and controls.
If you are not getting main power to the relay the fuseable link (yellow wire) is fried. If the pump relay is not engaging, the EEC relay could be toast (red wire). If you are getting power out of the relay but not to the pumps, the inertia switch may be tripped.

Posted on Jan 15, 2013

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Posted on Jan 02, 2017

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  • 195 Answers

SOURCE: 1996 f150 fuel pump

Hello;
You may have a break in the wire inside the tank to the fuel pump. I have seen the wires disconnect as the pump is installed.
Rich
RPM Northwest

Posted on Jun 10, 2009

  • 850 Answers

SOURCE: 2000 elantra no power to fuel pump.

could be a bad earth or [ground]
the power wire ma be brocken or have a loose or dirty connection
you neeed to trace it along its lenght to determine the fault!
so start at the pump & work back
Cheers rob

Posted on Jul 20, 2009

  • 1 Answer

SOURCE: no power to fuel pump or fuel pump wiring harness...

try the electrical ignition switch on the steering wheel colum

Posted on Aug 25, 2009

  • 1 Answer

SOURCE: fuel pump not working

I am have the exact same problem but my ground seems to be intact and getting a good ground. Do you have any other ideas on what may be cause the Fuel pump not to kick on?

Posted on Oct 13, 2009

sscullys
  • 984 Answers

SOURCE: 1997 Ford F150 Electric Fuel Pump will npt pump

Did you check the fuel inertia switch in the passenger side kick panel ?

The fuel pump is powered :
the fuse to the fuel pump relay.
The fuel pump relay to the fuel inertia switch
The fuel inertia switch to the fuel pump itself.

At the fuel inertia switch in the kick panel, power from the relay is the Dark Green w/ Yellow stripe wire and the pink w/ black stripe wire is the power. from the fuel inertia switch to the fuel pump.

If you jumper the fuel pump relay, you should hear it run. If not pull the fuel pump relay, and check the pins in the relay socket, pin 30 should be the power from the fuse.

50b0c31.jpg

If you have power at pin #30, jumper the relay socket as shown with the red line above, and check the dark green w/ yellow stripe wire at the fuel inertia switch for power.
Press the button on the top of the fuel inertia switch, and check for power leaving the fuel inertia switch on the pink w/ black stripe wire.

This is tests good, check for power at the fuel pump, same pink w/ black stripe wire.
Fuel inertia switch info is in the owners manual, If you did not get an owners manual with your truck ( purchased used ), you can download one from Ford :
https://www.fleet.ford.com/maintenance/owners_manuals/default.asp

Posted on Jan 03, 2010

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sscullys_122.jpg

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1997 Ford F150 Electric Fuel Pump will npt pump


Did you check the fuel inertia switch in the passenger side kick panel ?

The fuel pump is powered :
the fuse to the fuel pump relay.
The fuel pump relay to the fuel inertia switch
The fuel inertia switch to the fuel pump itself.

At the fuel inertia switch in the kick panel, power from the relay is the Dark Green w/ Yellow stripe wire and the pink w/ black stripe wire is the power. from the fuel inertia switch to the fuel pump.

If you jumper the fuel pump relay, you should hear it run. If not pull the fuel pump relay, and check the pins in the relay socket, pin 30 should be the power from the fuse.

50b0c31.jpg

If you have power at pin #30, jumper the relay socket as shown with the red line above, and check the dark green w/ yellow stripe wire at the fuel inertia switch for power.
Press the button on the top of the fuel inertia switch, and check for power leaving the fuel inertia switch on the pink w/ black stripe wire.

This is tests good, check for power at the fuel pump, same pink w/ black stripe wire.
Fuel inertia switch info is in the owners manual, If you did not get an owners manual with your truck ( purchased used ), you can download one from Ford :
https://www.fleet.ford.com/maintenance/owners_manuals/default.asp

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