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Fuel Pumps
Chevy Blazer
Chevy Blazer S-10

Is a whirring sound from a fuel pump normal or is it malfunctioning?


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Wiki User
2015-07-16 18:11:25
2015-07-16 18:11:25

Just be glad it is making a noise. that is a sign it is working.

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When you turn the ignition to ACC or On you'll hear a buzzing or whirring sound. If this sound isn't heard you'll have to drop the fuel tank and replace it. Get it done by a proffesional.

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Turn the key to the on position without starting the engine, listen closely or have a helper listen to the rear driver's side, where the fuel tank is. When the key is turned then fuel pump comes on, making a slight whirring sound. If there is no sound at all or something more than a slight whirring sound, it's probably about time to replace it. Also, if it takes a long time cranking to turn over the pump may not be building pressure properly.

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Try checking to see if your fuel pump comes on. To do this all you have to do is remove your gas cap and it's easier if you have somebody there to help you with the next step. Get in the truck and turn the key to the on position not running, then see if the other person can hear a whirring sound in where you removed the gas cap. If you do not hear a whirring sound then it's time for a new fuel pump, and if it is you have problems elsewhere.

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Your fuel sending unit is malfunctioning.

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If the fuel pump is working it will presssurize itself. Any air in the system will dissipate through the fuel pressure regulator and the injectors. You should hear a whirring sound when the fuel pump comes on at engine startup. If you don't you don't have any fuel pressure. Check the relay and the fuse.


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