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Have no power to run fuel pump - E-350 Ford Cars & Trucks

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Check the fuse indicating fuel pump this will be in the engine compartment. you can check it by taking out the fuse and testing to check if there is continuity with ohm meter. If the fuse is ok check if you have voltage going to the fuse same meter just voltage should be 12v. If yes test to see if you are getting power to the relay. try this get back to me.

Posted on Sep 29, 2010

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Why does the fuel pump relay don't click when i turn the key to run? and why there is no power at the fuel pump relay?


the operation of most fuel pumps is controlled by the fuel pressure regulator
when the fuel pump gets to set pressure , the pump is switched of by the ECM at the relay level
maybe nothing wrong with your system just the system working as designed
if you have pressure in the fuel manifold when you turn the ignition on then the pump will not run but will if there is a fuel leak somewhere and the pressure drops off

Oct 25, 2016 | Cars & Trucks

1 Answer

No power to fuel pump


Before you decide the fuel pump has no power understand how it works, The fuel pump only receives power when the engine is cranking over and when the key is first turned to run it will run for about 1 second and then the engine control computer shuts the relay off. So based on this information is the fuel pump getting power?

Jun 27, 2016 | Cars & Trucks

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I have a 1987 chrysler conquest tsi and fuel pump only runs when key is on start not on run but pump fuel lines not hook only power wires to pump is this how it works?


What does it do with the lines hooked up ? Most fuel injected vehicles need an RPM signal to let the computer know the engine is running to let power continue to the pump .

Feb 04, 2016 | Chrysler Cars & Trucks

1 Answer

MY JEEP TURNS OVER BUT WILL NT START. dOES THE 2001 MODEL HAVE A FUEL OFF SWITCH


The only manufacturer that uses a fuel cut off switch or inertia switch is Ford. Your jeeps fuel pump power supply is ultimately controlled by the cars computer. If you suspect there is a fuel pressure issue the first step would be to actually check fuel pressure with a fuel assure gauge. Or listen to see if you can hear the fuel pump run for a couple of seconds when you turn the key to the run position. If there is no fuel pressure or you can not hear the fuel pump run than the next step is to check for power to the fuel pump. You should be able to find the fuel pump harness back by the fuel tank. There will be a connector where the fuel pump harness plugs into the vehicle harness. You'll want to check for power to the pump by back probing the wires at that connector. There should be power for a couple of seconds when the key is turned on and any time the engine is cranking. If there is power the fuel pump is bad. If there is no power let me know and I'll be happy to help you with some further diagnosis.

Aug 15, 2011 | 2001 Jeep Grand Cherokee

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Fuel pump relay fault Can't find relay. No power to fuel pump. Checked fuses. All good


Model? Year?

Check per owner manual to be sure inertia switch is not tripped. Remember, fuel pump only runs for 5 seconds when key is turned ON, then it shuts off if engine is not running. Pump always runs when key is in START position.
Listen for pump to run inside fuel tank for 5 seconds after key is ON.

The PCM power relay turns on the PCM and the PCM turns on the fuel pump relay, which turns on the fuel pump.

See owner manual forfuse & relay charts.

Apr 06, 2011 | Ford Expedition EL Cars & Trucks

1 Answer

1996 olds 88 3.8 engine starts up runs about 15 minutes then shut down.Wait a while and will do same cycle over. I replace fuel pump, filter tank clean. No codes, engine runs find until it stops getting...


There is a fuel pump prime cycle (2 or 3 seconds)when you turn the key to on and once you start the engine the fuel pump power comes though the oil pressure switch.No oil pressure,no power to the pump.maybe your oil pressure switch has become weak?I would use a scan tool and command the fuel pump on when it does shut off,just to make sure the pump can run,as it could be a bad pump too.Also when it does quit,if you turn the key off for 10 seconds, you should get a prime cycle by turning the key to on.Have someone listen at the gas tank for a fuel pump noise,which will be only 2 or 3 seconds,but will do as a pump running check.Next would be to check for power at the back at or near the fuel pump,power and no pump.replace pump.No power to pump,follow power back to the front through oil pressure switch and fuel pump relay etc.You can always add your own power to the pump from a power source the switches off with the key if needed bypassing the existing wiring and oil pressure switch.

Mar 15, 2017 | 1996 Oldsmobile 88

1 Answer

Where is the fuel pump relay in a 91 ford explore??


In the underhood power distribution box, the fuel pump relay is the same as the a/c relay swap the two and see if your pump starts to run, if so replace it, if not check power at the pump connector located on top of fuel tank, if it has power and the pump does not run then the pump is bad, remember when testing for power the fuel pump only runs for about 3 seconds when you turn on the key, after that you have to crank the engine, hope this helps, let me know

Dec 08, 2009 | 1991 Ford Explorer

1 Answer

No power to the fuel pump. looking for a wiring diagram.


The 15a efi fuse pwoers the computer fuel system components including the pump. If you NEVER have pump power, I would check the FP terminal in the underhood diag connector...this is the FUEL PUMP POWER wire tap. If it never gets off zero at any key position (Run or crank) your problem is either wiring, the circuit opening/Fuel pump relay, or the efi main relay, or the fuse itself. If it has power in 1 position but not the other, suspect wiring, or possibly the airflow meter. fuel pump switch power is run thru the airflow meter, if its not hooked up, the fuel pump relay cannot be closed in the run position, or if its open internally or the contacts are bad.

Sep 17, 2009 | 1991 Toyota Pickup

1 Answer

My saab 1994 900 s has no power to fuel pump


Fuel pump runs or not ? If runs and no presure at out put line than either the pump is toast or the filter (before the pump) is plugged or plane Jane no fuel or a pin hole in the suction line (draws air instead of fuel), if the fuel pump does not run, than check the fuse and the connector at the pump to ensure power goes to the pump.

Aug 22, 2009 | 1994 Saab 900

1 Answer

Fuel pump will not run


THERE IS A FUEL PUMP SHUT OFF SWITCH(INERTIA) ON THE PASSENGER SIDE KICK PANEL.INSIDE CAB UNDER DASH.IT INTERUPTS POWER TO THE PUMP IF U ARE IN A COLLISION.PUSH THE RED BUTTON ON TOP OF IT.IF THAT DOES NOT WORK CHECK FOR POWER IN AND POWER OUT.NO POWER OUT BAD SWITCH.NO POWER IN OTHER PROBLEM

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