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fuel pump noise
Posted 03 May 2007 - 10:26 AM
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?
Posted 03 May 2007 - 11:07 AM
Posted 03 May 2007 - 11:18 AM
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?
Posted 03 May 2007 - 01:35 PM
Are you sure your not hearing air bubbles in the heater core? How does one hear air bubbles in a fuel system?
Posted 03 May 2007 - 06:26 PM
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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