The in-line fuel filter on a 1977 Ford F250 I6 protects the carburetor and engine from particulate matter in the gasoline which could clog and damage internal components over time. The fuel filter itself eventually becomes clogged with normal use, especially in older vehicles with dirty fuel tanks, meaning it should be replaced regularly. A clogged fuel filter will result in rough running and loss of engine power, but it's a relatively easy and inexpensive part to replace.
This process does not require tools.
Replace an In-Line Fuel Filter
Unscrew the flange holding the air filter and its housing in place over the carburetor and remove the housing. Locate the fuel line entering the carburetor.
Place a rag under the junction of the fuel line and carburetor. This will soak up any fuel which spills when you remove the fuel filter.
Unscrew the fitting holding the fuel line to the fuel filter with a wrench. Unscrew the fuel filter from the carburetor inlet.
Replace the filter with a new one, screwing it into the carburetor and then screwing the fuel line onto the new filter. Tighten the fittings and remove the rag.
Start the truck's engine. Check for leaks around the new fuel filter. Shut off the engine.
Replace the air filter housing. Tighten the flange nut to secure it.
Tips & Warnings
Use a line wrench instead of a standard open-end wrench for a better grip on the fuel filter fittings.
Gasoline is flammable. Avoid sparks or open flame when working on a vehicle's fuel system, or an explosion may result.
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