Pontiac equipped its 1986 Firebird with a carburetor-mounted fuel filter. Unlike other types of fuel filters, which are typically encased within a plastic or metal housing, the Firebird's fuel filter consists of an element within a large fuel inlet nut. Because the element is at the top of the engine, replacing the filter is fairly straightforward.
Tools Used: Screwdriver, Open-end wrench
Install a Fuel Filter
Remove the wing nut from the top of the center of the air cleaner assembly. Lift the air cleaner assembly off of the carburetor.
Locate the fuel filter assembly on the side of the carburetor. The filter is encased within the fuel inlet nut. A rubber fuel line attaches to one end of the nut.
Loosen the clamp on the end of the fuel line, where the line enters the fuel inlet nut, with a screwdriver, and pull the line off of the nut.
Grasp the fuel inlet nut with an open-end wrench. Twist the nut counterclockwise until the nut detaches from the carburetor.
Pull the spring out of the carburetor-side of the fuel inlet nut. Pull out the fuel filter element.
Slide the new fuel filter element into the fuel filter nut, and put the nut's spring back in place.
Position the spring-side of the fuel inlet nut against the carburetor, and tighten the nut with a wrench until secure.
Push the fuel line onto the metal fitting on the fuel inlet nut and tighten the line's clamp with a screwdriver to secure it.
Position the air cleaner assembly onto the threaded rod on top of the carburetor. Hand-tighten the assembly's wing nut onto the rod.
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