The fuel filter on your Ford F-150 removes debris and contaminants from the fuel before it reaches the carburetor or fuel injectors. Ford used several different styles of filters through the years, and in later models some fuel filters mount to the frame. Due to these variances, the exact process for changing the filter may vary based on the year of your truck. The most common motor used in the F-150 trucks was a 4.9-liter inline 6-cylinder engine, and until the early '90s this was a normally aspirated, non-fuel-injected engine. The fuel filter for this truck is a screw-in filter at the carburetor and you can purchase a new one at most auto-parts stores.
Tools Used: Wrench set
Change an Fuel Filter
Remove the air clearer from the engine by loosening the wing nut on top of the air cleaner assembly and pulling it straight up and off the carburetor. Set the assembly aside for now.
Locate the steel fuel line and follow it to the carburetor. At the end of the line you will find a small round filter threaded into the carburetor. Unscrew the fuel line fitting from the front of the filter using a wrench and move it out of the way.
Place a wrench on the nut-shaped front of the filter and turn it counterclockwise to remove the filter from the carburetor. Thread the new filter into the carburetor using your hand until it is snug, then tighten it with a wrench.
Line up the fuel line and fitting in the front of the filter and thread the fitting in with your hand. Tighten the fitting with a wrench once you are sure it has started into the threads squarely. If it gets cross-threaded or screws in off center, it will leak and pose a serious fire threat for your truck.
Reinstall the air clearer housing on the carburetor and install the wing nut on the center stud. Tighten the wing nut by hand.
Start the truck and visually check the line to ensure there is no fuel coming out around the filter or line.
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