How to Remove a 2004 Avalanche Gas Tank

by Gregory Crews
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pumping gas image by Mat Hayward from

Removing the gas tank in a 2004 Chevrolet Avalanche is straightforward, as the tank is located under the truck. The fuel tank is susceptible to debris, as gasoline from the gas station may have debris and sediment that has accumulated in the tank. This debris can build over time and cause the fuel pump to malfunction or cause the truck to receive poor fuel economy.

Step 1

Open the hood to access the battery. Disconnect the battery with a socket wrench. Ensure the positive and negative cables are disconnected.

Step 2

Chock the front wheels to prevent the truck from moving while it is raised. Place the chocks to the front of the wheels.

Step 3

Place a jack to the back of the truck, under the differential, and raise it high enough to place jack stands under the axle. Lower the truck onto the jack stands.

Step 4

Place a jack under the gas tank at the back of the truck, which is under the bed, and raise it so the fulcrum of the jack is just under the gas tank. This will help to lower the jack once the straps are removed.

Step 5

Unbolt the the two straps holding the tank up with a socket wrench. There will be four bolts to remove.

Step 6

Lower the tank slightly to access the wires, lines and hoses on top of the tank. Disconnect each of the lines by pulling the quick-disconnect fittings apart. Ensure all the lines, wires and hoses are pulled away from the tank.

Step 7

Unscrew the hose clamp on the back of the fuel tank with a flat-tip screwdriver. This hose is the fuel filler hose. Pull the hose off the tank.

Step 8

Lower the tank to the ground to pull it out from under the truck.

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