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Guest Message by DevFuse

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fuel pump noise

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4 replies to this topic

#1 nickb21


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Posted 03 May 2007 - 10:26 AM

'02 OBW, ~82k.

Within the last few thousand miles I have noticed that my fuel pump seems to be getting a bit louder when it first 'primes' the system on a cold start. It's a deep whirring, almost grinding noise. Once it's warm it does the standard few second whistle. Happens on full and empty tank, although it seems to be a bit louder on an empty tank (as i would expect).

Fuel filter replaced about 20k ago, I suppose I'll try replacing it again to see if that helps.

Any other thoughts, is my pump heading south?


#2 Legacy777



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Posted 03 May 2007 - 11:07 AM

If it's just louder, I wouldn't be super worried....grinding noises are never real good though.

#3 porcupine73


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Posted 03 May 2007 - 11:18 AM

I'd try changing the fuel filter again too, with oem is possible, since a lot of stuff could get in there in 20k miles. It also might be that your fuel pressure is bleeding down when the vehicle is off. I have noticed that right after changing the fuel filter or releasing pressure on the fuel system, the fuel pump is a lower pitch sound and is much more noticeable. When the pressure is up, it's quieter and a higher pitch sound.

Next time you the low grindy noise when turning key from acc to run, wait a few seconds, go back to acc, then to run again and do that a few times. See if the pump sound then goes to the higher pitch sound. If so I suspect the fuel pressure is bleeding down when vehicle sits.

Oh also sometimes I hear air bubbles in there too; it might sound like grinding?

#4 nipper


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Posted 03 May 2007 - 01:35 PM

I had a noisey fuel pump once. It never affected the car. You may want to throw a fuel pressure gauge on the car just to check the pump.

Are you sure your not hearing air bubbles in the heater core? How does one hear air bubbles in a fuel system?


#5 porcupine73


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Posted 03 May 2007 - 06:26 PM

Yes a pressure and volume test could be good too.

I hear air bubbles sometimes after changing the fuel filter. I cycle the key from acc to run a dozen times or so waiting a few seconds in run to cycle the pump. I think as the fuel filter's air gets replaced with fuel, the air bubbles back into the fuel tank? Usually it's not too much but it sounds bubbly to me.

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