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I'm having fuel pump problems. I'm only getting 4 volts to the pump.Why would I only be getting partial voltage.

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This could be a fault internally with your fuel pump relay. If the contacts have corroded, or become scored, the voltage to the fuel pump will be drastically affected. Hope this helps....

Posted on Mar 12, 2011

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I have a 2002 Honda 954RR. The fuel pump is not kicking on when I turn the key. How do I check the fuel pump relay to see if its working


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I have 1987 Chevy Silveraldo Fuel Pump lost its 12 Volts


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Car is not getting any gas. poured a little gas in the carb started for few seconds. . disconnected connector where it plugs into fuel pump. Getting 9.7 Volts . Should that be 12 volts ? any advice...


If your fuel pump is shot, it wouldn't matter if it was getting 24 volts, but, Unless you have a capacitor or a voltage thing in the line, it should be 12 volts, the breaker could cut the voltage, But I would suspect the fuel pump to be the culprit. If you say the car started when you poured in the gas. You can access the pump in a few places, I don't know where they stuck yours, but it could be on the frame, in the rear, or in the tank, access through the trunk floor, or drop the tank. An aftermarket electric pump could be used if you wanted to. Hope this helps.

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On the plug that goes into fuel pump . it has 4 wires a ,b .c.d shouldnt i be getting 12 volt from one of them?i only get 5 volt from one.fuel pump does not work


You should have 12 volts at the gray wire.The black is ground make sure and use this wire also.This way you know the ground is good also.When you turn the key on you will only get battery voltage for 2 seconds with the key on.If you crank the motor then you will get battery voltage also.Hope this helps.Good luck.

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I need to know how to test the fuel pump for power, and determine if its failure is due to wiring, and not itself?


The pump in your truck is a common failed part. This is more so if you run the truck below 1/4 tank often. Disconnect the wiring from the top of the fuel tank and test the wires for voltage when you turn the key to start. The voltage should be present for about 3-5 seconds. If you have 12 volts then replace the pump. There will be voltage present on another wire also. 5 volts. This low voltage is for the fuel level sender.

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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.

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The fuel sending unit only controls the gas guage not the fuel supply to the vehicle. The pump is twelve volts. If you are not getting twelve volts on the PUMP wires check the fuel pump relay and the key circuit to it. If you have to cycle the key three to four times rapidly to get the vehicle to start check the fuel pump pressure at the regulator for manufacturer specs. An injector stuck open will also cause same problems you are describing.

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1 Answer

Fuel not working


should have 12 volts at pump during engine cranking. with key in "on" position, the fuel pump only gets voltage for 2 seconds if engine is not running. Read voltage during cranking. Check fuel pump relay in battery jucntion box under hood.


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