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You have to drop the fuel tank carefully (easier to do if the tank is empty). Disconnect hoses and wiring connectors from the pump/fuel level sensor. Vacuum or brush off any debris on the fuel pump and around the locking ring. Remove the locking ring and wiggle the pump assembly out.
When you turn the ignition key to the on position can you hear the fuel pump running? The fuel pumps are notorious for failing. The fuel pump is located in the gas tank and you'll have to drop the tank to replace it.
George, No simple diagram for changing the fuel pump. It is located inside the gas tank. The gas tank needs to be removed to change the pump. The pump is part of an assembly which consists of the pump, fuel gauge sender and pick up. You also need to change the fuel filter when you change the pump. It should take a professional mechanic about 3 hours to drain the fuel out of the tank, remove the tank, change the pump and fuel filter. Multiple the mechanic's time by whatever the repair shop charges per hour for labor. There are several different pump assemblies for the vehicle. Price depends on whether it's 2 or 4 doors and 2 or 4 wheel drive. Best guess is about $600 total.
IF it has one, it will be located along the inside of the frame, below the drivers door. Many versions of 2003, 2004, 2005, Tahoe did not use frame mounted fuel filters, but relied only on a "sock" in the tank on the fuel pump pickup.
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