Question about 1990 Ford F150

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Fuel pump keeps running

1990 F150 fuel pump continues to run even when keys off

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My 90 Ranger did that when I put in a cheap relay. It's under the fuse block under the hood.

Posted on Nov 24, 2008

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Fuel pump continues to try to function when truck key is off.while key is off if i switch to opposite tank that pump starts to function even w/key off


fuel pump is going bad. or your pressure return is stuck. or your relay to the fuel pump is sticking .plugged fuel filter. bad ground to the pump. that is all i can think of besides a faulty key switch.but most likely its a pressure issue fuel injection needs a certain amount of pressure to fire the injector so when you change tanks the pump has a pressure change so the pump starts to keep up pressure. hope it helps

Dec 27, 2012 | 1990 Ford F150

2 Answers

Fuel pump continues to run when vehicle is not running, no keys in ignition


Your fuel pump relay is bad,the circuit is staying open,causing power to run to it.Here's a link to where it's at,will send another pic of what it looks like.

Nov 25, 2012 | 1990 Ford F150

1 Answer

Truck wont stay running. acts like its running out of gas .have already changed fuel filter.


fuel pump may be weak and not able to keep pressure to keep it running. check fuel pressure to see.

Jan 30, 2011 | 1990 Ford F150

2 Answers

My 1990 F150 will not start sometimes. If I turn the switch to the on position and the fuel pump continues to run after 5 Sec , It will not start. If the pump stop running after 5 Sec , it will start.


when u turn the key to run but don't start the fuel pump shuts off after 5 seconds + or - 2 seconds, this is normal, the common cause of no start on your truck is the TFI ignition module on the distributor, subject of many recalls for failing, also change the stator inside the distributor, use factory parts, aftermarket parts fail very quickly. here is a picture of the parts.
da17e03.jpgThis is the stator

This is the TFI ignition module.

Apr 02, 2009 | 1990 Ford F150

1 Answer

1990 f150 fule pump wont shut off when truck is shut off


Check the power supply going into the fuel pump relay. If it is still hot when the ignition is off then your ignition switch is probably the problem.

Feb 17, 2009 | 1990 Ford F150

1 Answer

1990 ford F150 4 x 4 5L


Then the engine fuse may be blown it will be marked ECM I think, the fuel pump and injector circuits are two seperate systems, the fuel pump most likely has a stuck relay.

Oct 21, 2008 | 1990 Ford F150

1 Answer

Truck dies


Listen For Fuel PUMP key on only not running. it will buzz a few secs, every time you cycle key from off to on .if no buzz Bad fuel pump.I have Duel tanks MY rear pump went out.

Aug 04, 2008 | 1990 Ford F150

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