The GMC Sierra pickup truck uses an in-line filter to filter the debris out of the fuel lines. Debris and sediments accumulate in the fuel tank and eventually will get sucked up into the fuel lines by the fuel pump. The strainer on the fuel pump will miss some of the smaller debris. Replacing the fuel filter every 30,000 miles will help to keep the fuel system clean and improve fuel mileage.
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Things you need
- Line wrench set
- New fuel filter
Open the bonnet for access to the engine compartment. Depressurise the fuel line by pulling the fuel pump relay. The relay is located in the fuse panel under the bonnet behind the battery.
Start the truck and allow it to stall. The fuel system is depressurised. Insert the relay back into the fuse panel.
Locate the fuel filter by tracing the fuel lines coming out of the fuel tank. The filter will be located a foot from the tank under the truck on the driver side.
Unscrew the inlet and outlet lines by loosening the fuel line with a line wrench. Hold the filter in place by holding the nut on the filter with a second line wrench.
Pull the filter out of the mounting bracket by sliding it out and away from the bracket.
Slide the new filter into the mounting bracket. Ensure the arrow on the filter is pointing toward the front of the truck, as it designates the direction of fuel flow.
Screw the inlet and outlet lines onto the filter by hand. Tighten with a line wrench. Use a second line wrench to hold the filter still while tightening.
Start the truck by turning the ignition to the "Start" position. Hold the key in this position for two seconds to allow the fuel pump to push fuel through the lines. Repeat this until the truck starts.
Allow the truck to idle while inspecting the filter for any leaks. Inspect around the filter and the fuel lines.
Tips and warnings
- The fuel filter can be purchased at any local automotive-parts store.
- Use caution with gasoline as it is flammable and highly toxic.
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