Question about 1985 Ford F 250

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No power to fuel pump.

I have lost power to the fuel pump, I replaced the relay switch and still no power, the relay clicks. Unhooked the wires from the pump and checked with a test light, my wife cycled the ignition while using test light. Have power to the fuel gauge. Checked the fuse and it's good.

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  • Anonymous Mar 23, 2014

    cut off switch ok, relays klick when key turned, no power at fuel pump.

  • Anonymous Mar 23, 2014

    fuel pumps run and work when wired direct, I have checked the enertia switch, and have power to it

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Have you checked both the power in and power out of the relay?I know the relay clicks but it doesnt mean its releasing power to the pump wire.Have you checked that the earth for that circuit is ok and that the wire to the pump is undamaged?

Posted on Oct 14, 2008

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If you are getting power to the pump, it should work unless the pump is bad.

Posted on Oct 14, 2008

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Check your fuses under the dash and under the hood

Posted on Oct 14, 2008

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Fuel shutoff. for or 20002 dodge stratus location emergency.


I just looked at a wiring diagram of the fuel controls for this model: there is no fuel shut-off switch in the wiring. It's pretty straight forward, typical fuel pump controls: the fuel pump relay is in the under-hood power distribution center. When this relay is turned on, power is sent to the fuel pump, nothing else is in the path of the hot wire to the pump module so it (the pump) should be working.

So if pump is not on, you can diagnose the wiring right here at the fuel pump relay. First you verify the power feed for the pump is available at the relay. (One terminal at the relay will have battery voltage with key off. If you pull the relay out and use a test light, one terminal position will be hot.) Next you verify the relay is working, sending power to the fuel pump in the gas tank. You do this by having someone cycle the key to on, while you hold a finger on the relay (it's back in place) to feel it click on. You should feel it, maybe even hear it, the relay will energize every time the key is turned to on, and this is what sends power to the fuel pump.` If it all works, and the pump is not on, the pump probably needs replacing. If the pump relay is not clicking on, that's a wiring hassle, including the wire to the engine computer. The pcm is what controls the relay turning on.
Do you know if the fuel pump has ever been replaced in the car? If it is original, it has been a good long run.

Mar 05, 2016 | Dodge Cars & Trucks

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Keeps blowing the fuse relay. i unhooked the fuel pump & replaced the fuel pump relay under the hood. any ideas?


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Sep 06, 2015 | Cars & Trucks

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My 02 jeep liberty isn't getting power to the fuel pump as well as my fuel Gauge doesn't work with the key o. Haven't been able to get it started in week now??? What could this be???????


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Location of inertia switch


As far as I know a Chevrolet doesn't have an inertia switch like a Ford.
I am assuming you have lost fuel pressure, first thing to check is the fuel pump relay (usually in a fuse box under the hood) make sure you have power to that point (you should hear it clicking when you turn the key on) if you have power chances are you have a bad fuel pump. If you have lost key power to the relay, check the fuel pump relay fuse in the dash for power ( if the fuse is bad replace the fuse and the relay) if no power to the relay fuse you may have a faulty ignition switch, its a common problem with 00-06 Chevy's across the board.

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1 Answer

I replaced the turn signal switch and now it wont start. i can hear the fuel pump kick on. makes no sense


You said you hear the pump come on, then said fuel pump not running ???
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If the relay doesn't click when key turned on, check for the power feed for the pump at the relay terminal. If the relay has power available to be transmitted to pump, then the relay's signal from the computer or the ground side of the relay's coil signal (from the computer) may need checked.
If the pump is working, and you have good pressure in the lines, check the injector circuit. Also a fused circuit, so check the fuse first. The injector should have a steady voltage signal to it with key on. The injector only has two wires, the power wire and the ground wire which goes to the computer. When the computer momentarily grounds the injector circuit, the injector "pulses", causing fuel to spray out the bottom.

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93 chevy caprice 5.0 new fuel pump changed relay and fuse still can't get pump to work can't even get relay to click checked power to relay and used jump wire to pump prime wire pump works w


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1 Answer

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  • Code 542 indicates one of the following conditions:

Engine Starts:

· Fuel Pump secondary circuit shorted to power

· Fuel pump relay contacts always closed

· Open in fuel pump monitor (FPM) circuit between ECU and connection to POWER TO PUMP circuit

· Heated Exhaust Gas Oxygen (HEGO) sensor shorted to power

· faulty ECU

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· Open inertia switch or inertia switch circuit

· Open in or between ECU and fuel pump (This includes open in fuel pump brushes/windings)

· faulty ground connection at fuel pump

The easiest way to check this circuit is to go to the fuel pump relay. If the relay clicks when the key is turned to the "RUN" position, then the inertia switch circuit is ok.

The Pink/Black wire starts from the fuel pump relay and goes two directions. One side goes back to the fuel pump. The other side is the fuel pump monitor circuit and goes to pin #8 at the ECU. This wire should only be hot for a second or two when the ignition is turned to the RUN position.

The fuel pump relay receives power on the Black/yellow wire. It comes from a fusible link at the power distribution center. This wire should be hot at all times.

If all the above is working as designed, them you probably have a bad fuel pump.

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1 Answer

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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