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#1
10-15-2004, 07:34 PM
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Concerned about my '93 Supreme
A week ago when I started my car there was this high pitch hum coming from the car and now it's getting a little bit louder. I can place this sound from the rear where the fuel tank is. Could it be that the fuel pump is about to go on the fritz?
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#2
10-16-2004, 08:14 AM
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If you want to test the fuel pump, then ground the wire that appears to be hanging there, connected to nothing, between the air fiter housing, remote + terminal, and the cruise control vacuum module.
This procedure is outlined in the GM Manual as well as a Haynes manual. Since the fuel pressure regulator is closed, the fuel is actually pumped back to the tank.
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