The fuel filter removes contaminants from the fuel supplied to the engine. The fuel filter in the 1994 Toyota Corolla (and Geo Prizm) should be replaced every 30,000 miles or 24 months (Reference 1). Replacing the filter allows the engine to retain its full power and ensures long engine life (Reference 2).
Open the hood and disconnect the negative battery cable.
Locate the fuel filter. It is in a bracket that is located on the firewall (near the brake master cylinder).
Clear away anything blocking access to the top of the filter.
Remove the threaded banjo bolt at the top of the filter, using a backup wrench to keep the filter from twisting.
Loosen the flared fitting at the bottom of the filter using a flare-nut wrench, if possible.
Remove the bracket bolts, the used filter and the filter support bracket.
Install the new fuel filter in the support bracket on the firewall using the bracket bolts.
Attach the inlet and outlet pipes to the filter, using the new crush washers that are supplied with the filter, and tighten them.
Replace anything that was moved for access to the filter and reconnect the negative battery terminal (Reference 1).
Start the car and check the filter for leaks.
