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If I let a F150 run out of gas does the fuel pump continue to run?


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Most original fit EFI in tank fuel pumps are designed to shut down when the engine stops running with the ignition switched on. This is a safety system eg inthe event of a frontal collision which disables the engine and a fuel line is severed the fuel pump should shut off. Its considered not a good idea to run out of fuel as this can cause internal damage to the fuel pump also poss cause the fuel filter to be contaminated. Is this a siutable answer?

Posted on Nov 29, 2014

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You need to specify the year of F150
If it has an in-tank pump, running it out of fuel risks over heating the pump as it relies on being submersed in fuel for cooling.
When you switch the ignition on without starting the truck you should be able to hear the pump run and stop when it builds pressure in the fuel system.
If you or your buddy listening at the tank hear nothing. Check the fuse for the fuel pump first. If the fuse is OK then likely the pump is bad. OH! make sure there is fuel in the tank first.

Posted on Nov 29, 2014

Testimonial: "The tag on the door says it was built in April of 1994 but the title has it listed as a 1995. I can't hear the pump run. When I turn the key on all I hear is a click. I'll have to drop the tank some so I can check voltage at the tank. I should probably plan on getting a new pump."


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SOURCE: electric fuel pump inertia switch?

On a 1992 Daihatsu Rocky where would you find the electric fuel pump inertia switch?

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SOURCE: electric fuel pump inertia switch?

where is the fuel pump pressure switch located no 1992 z28 camaro. also there are 3 wires coming out to fuel pump at back of car pink grey brown what do they go to.

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SOURCE: My 1990 F150 will not start sometimes. If I turn

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.

Posted on Apr 02, 2009

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

need to check for power to fuel pump relay and wiring to pump

Posted on May 27, 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

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I have a 91 ford f150, cannot find the inertia switch, looked the 2 places another website said, but it is not there. Please help, my truck runs then shuts itself off and fuel pump is working.

Please help, my truck runs then shuts itself off and fuel pump is working. Well then ,it's not the fuel inertia switch . Your guessing because you have no clue . Probably ignition problem . When it shuts off does it start right back up ? Or do you have to wait a bit ? If you hear the fuel pump running the inertia switch is fine ,this switch shuts B+ voltage off to the fuel pump . So if you hear the pump running it's not the inertis switch . There is also an ignition system , check for spark , pull a plug wire off an hold near ground . Probably the ignition module .

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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.


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 :

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