Question about 1987 Ford Escort

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If I directly apply 12V from the battery to the fuel pump, it pumps. If I plug the the wires into the wiring harness to use the car's organic circuitry, the fuel pump does not pump. By attaching a multi-meter to the car's organic circuitry, I get an inconsistent reading. It fluctuates between .05V to about 8V very rapidly. I'm not sure what would cause this, and I was hoping someone could help with that. Also, I guess I should mention that the vehicle does not start or run. Thanks

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Try finding the fuel pump relay. Swap it out with another one and see if that makes a difference.

Posted on Oct 11, 2010

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Trying to figure out fuel pump. will not energize when ignition is on. Fuel sending unit works fine but will not deliver fuel.


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you said you tried applying direct voltage to the pump? proceed to remove the fuel tank and check the harness inside for continuity, both wires going to the pump itself. If wires prove to be ok , then proceed to replace pump .

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You should have battery voltage on that 30 amp wire before the relay and then on the dark green and black wire going to the pump.
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Jun 24, 2012 | Cars & Trucks

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Hello Hope you all doing well... My car is Alero 2000 stopped suddenly at the road, I took it pushing to my home :(( I thought the problem with fuel pump, coz there is no fuel coming to the engine, but...


You will need to trace the wiring to the pump and look for an open or short. I had one where the connector from the pump to the wiring harness (near the RR wheel) had a loose ground connection. The only way I found it was to move the cable and when I heard the pump run I knew where the problem was.

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Fuel pump will not run in car but will on the


You need to cuss a whole lot more than twice. A voltage meter would be more useful in determining the actual voltage making it to the fuel pump. Something around 12v DC would be appropriate. If you are not getting at least 12v, you need to check the battery, the starter relay, and the fuses to the fuel pump for any corrosion, and make sure you are getting at or near 12v DC.

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Put new fuel pump now the pump runs but the power wire only has 7 volts of power how much is it suppose to have


If your pump is running on 7vdc, you are not getting enough fuel pressure to sufficiently supply the engine with gas, and it will run rough, sputter, surge, backfire, all manner of unpleasant things. If this is the case, and you are reading 7vdc while the pump is connected, this could indicate a problem within the fuel pump or fuel pump electrical circuit. Turn the car off, unplug the fuel pump wire harness from the fuel pump, insert your voltmeter leads into the vehicle-to-fuel pump wire harness connector, then have a helper turn the key to "on." You will have two-three seconds before the computer senses no fuel pump return signal, and shuts off voltage to the fuel pump. Observe the voltage coming from the vehicle wire harness to the fuel pump connector, it should be 11-13vdc. If it is, and only drops to 7vdc when connected, there is a partial short in the wiring from the point the fuel pump plugs into the harness, or the pump just creates a large voltage drop. Every device causes a voltage drop while in use, but 5vdc is too much of a loss. Re-examine the fuel pump installation, and make sure there are no obstructions over the fuel pump inlet, and that the wire harness inside the tank is okay.

Jan 26, 2010 | 1997 GMC Jimmy

1 Answer

I just replaced the fuel pump again, it engaged and pump worked, once! what could cause this? any relays or fuses to look at?


It's common for the wire harness from the pump to the frame to go bad when the fuel pump is replaced. The harness is around $15.00 and should be replaced the same time the fuel pump is replaced. If you can get to the wire harness to move it around and see if the fuel pump would start to work, then you know it's the wire harness and you can also disconnect the wire harness at the frame to check for 12v. Food for thought also, was the fuel filter replaced shortly after the fuel pump??? It may have picked up dirt that got in the gas tank and is not to dirty to let fuel flow through. Good luck and keep me posted.

Dec 22, 2009 | 1996 GMC Sierra

1 Answer

No Power to Fuel pump


I would check the ground for the fuel pump relay that operates the switch side of the relay.
You should have 2 12v inputs to the relay. When the relay gets 12v input, it closes the relay switch on the heavy current side that sends 12v to the fuel pump.

A relay is needed because you don't want heavy current going through the switch.

Also, most cars only run the fuel pump for 2 seconds when the key is turned on because you don't want the fuel pump running without the car running. If you listen closely at the fuel tank, you should hear the pump run for 2 seconds when you turn the key to "ON"
When the key is turned to "START", the fuel pump should run continuously.
The engine computer tells the fuel pump to shut off if the engine rpms are zero.
So, I would check the switch side of the relay. Power amd ground.

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1 Answer

2004 Kia Sedona wont start but i can hear starter.


if the starter is revving very slowly it is the battery, charge battery. if not, It can be three things happing. 1 no spark 2 no fuel 3 no crank signal or the car computer is bad- you will need to unplug one of the spark wires and remove the spark plug and put the spark plug in the spark plug wire boot, and touch the spark plug on any metal on the car and have some start the car. donot touch the spark plug itself and see if there is a spark. if spark is bright, then it is not spark plug and wires but if no or spark is not bright, check the spark plug wires by applying a little bit of water on the spark plug wire and take a 12v test light, connect the clap to ground and and have some one to crank the vehicle, touch allover the spark plug wires with the tip of the test light, if you see spark, replace the wires and change the plugs.. they are not good. if spark is present, check for fuel by removing any one of the spark plugs and see if it is wet. if wet fuel pump is ok but if not go look for the fuel pump fuse and relay. is fuse blown, replace, check the relay resistor with a volt meter. it should be around 40 to 80 ohm. if everything is good from this point check the fuel pump itself by disconnecting the connector to the pump and apply 12v and ground using jumper wires or some wires to the fuel pump if you donot hear the pump,replace pump. if you, the crank signal or computer may be the problem

Jan 02, 2009 | 2004 Kia Sedona

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