Question about 2004 Pontiac Grand Prix
A humming noise in the gas tank is usually a failing fuel pump.
The pump uses liquid gasoline to keep it cool and lubricated.
Posted on May 02, 2013
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Posted on Jan 02, 2017
SOURCE: Fuel Pump Relay Switch
Underneath your hood, behind the passenger side headlight, behind the core support, is a bank of 2-8 relays. One of those relays is the relay needed for your fuel pump. There will also be a fuel pump relay fuse located there. The relay designation should be on the cover of the relay compartment.
Posted on Jan 03, 2009
Is the security light active? If yes it will have to get reprogrammed by the GM dealer as GM has this as a propriatory system... Meaning no one else can work on it.
Posted on Sep 14, 2009
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