The fuel filter cleans gas of dirt and rust particles before it enters the engine. This minimizes damage to the fuel system. Fuel filter inspection and (if necessary) replacement should be performed approximately every year or 30,000 miles for fuel injected systems and every 15,000 miles for carbureted engines. Since the 1989 Corolla is available with either a fuel injected or a carbureted engine, there are two distinct approaches to changing the filter, based upon the engine type.
Tools Used: Pliers, Fuel Filter, Screwdriver, Wrench, Fuel line plug, Torque wrench
Change the Fuel Filter
Carbureted Engine
Perform this procedure when the engine is cool--never when the engine is hot. Locate the fuel filter in the engine compartment near the charcoal canister. It is a cylindrical plastic object with two lines attached to it.
Loosen the hose clamps on the fuel lines leading to the filter one at a time with a pair of pliers or screwdriver (depending upon the clamp type). Once loose, slide the clamp down the supply line. Pull each hose off of the filter housing by twisting gently near the end of the hose to loosen. Once the hoses are removed, pull the filter out of the clip assembly while holding it upright so as not to spill any residual fuel, and discard the filter.
Insert the new filter into the clip assembly. Orient the filter so the arrow is pointing towards the hose that runs to the carburetor.
Slide the hoses back onto the nipples of the fuel filter, slide the clamps back into place and tighten them. Start the engine to verify there are no leaks in the system and that the filter is functioning properly.
Fuel Injection
Perform this procedure when the engine is cool--never when the engine is hot. Locate the fuel filter in the engine compartment; it is near the injection manifold. It is a round metal cylinder. Remove the protective shield from the filter by unbolting the retaining screws.
Place a pan under the fuel delivery line to catch residual gas. Slowly loosen the union bolt with a wrench to release the system pressure. Once released, remove the union bolt and allow any remaining fuel to drain.
Disconnect the fuel inlet line and place a plug on the end to prevent additional fuel loss. Remove the fuel filter by loosening the bolts on the retaining clip and sliding it out.
Slide the new fuel filter into place and slightly tighten the bolt on the retaining clip to hold the filter in place. Reconnect the fuel filter inlet line and hand tighten the bolt. Reconnect the delivery pipe and hand tighten the union bolt.
Tighten the bolt on the inlet line and the delivery bolt to 22 ft. lbs. using a torque wrench. Turn on the engine and check for any leaks. If no leaks are detected, reinstall the protective shield.
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