RE: [DML] Fuel Pump "Buzz"
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RE: [DML] Fuel Pump "Buzz"

The following description was offered by Steven in Houston when I called to report the same problem.

If there is contamination in the fuel tank, it will get sucked against the filter screen inside the tank.  More and more debris will accumulate against the screen, and the pump will get louder as fuel flow is restricted.  When you shut the car down, even with the check valve, eventually the suction at the intake of the pump will fall off and some debris will float away agian loose in the tank, until the problem restarts next time.

Basically the pump makes more noise when it gets warm it seems, that can be from a hot tank so the pump does not stay as cool, or from an overheating pump which is working too hard. If your car sputters or has low power when the whine gets bad suspect debris.


-----Original Message-----
From: dmcnews@xxxxxxxxxxxxxxx on behalf of dadoc2791
Sent: Fri 2/29/2008 7:41 PM
To: dmcnews@xxxxxxxxxxxxxxx
Subject: [DML] Fuel Pump "Buzz"
The other day I noticed that my fuel pump has begun making noise - a 
Buzzing sound, about 3-5 times as loud as it normally does when 
running.  I found today that when cold, it's completely quiet.  After 
being driven about 1-1½ hours, it begins getting louder.  The engine 
runs perfectly at any speed so I know the pump is delivering ample fuel 
and pressure but I'm concerned about it.  I've ordered a new pump from 
John Hervey and figure I'll keep this one as back-stock, in case it's 
needed in a hurry at some later date.

Any ideas on what might cause this added noise to a pump that otherwise 
seems to be operating perfectly?

Craig Werner

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