GMC 25121293 Filter,Fuel

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On all GM cars, the fuel filter is located inside the fuel inlet to the carburetor and is made of pleated paper or bronze. Neither type can be cleaned and reused. This job should be done with the engine cold, using open end wrenches to fit the fuel line nuts. Flare nut wrenches should be used if available. You will also need a replacement filter and clean rags. Remove the air cleaner assembly and note the positions of any disconnected vacuum hoses. Follow the fuel hose from the fuel pump to the carburetor, placing rags under the fuel inlet fittings to catch any fuel. Use the proper size wrench to hold the nut next to the carburetor body and loosen the nut-fitting at the end of the metal fuel line. With the fuel line disconnected, move it slightly for better access to the inlet filter nut. Unscrew the fuel inlet filter nut and be careful not to lose the thin washer-type gasket or the spring located behind the fuel filter. Compare the old filter with the new one, then reinstall the spring into the carburetor body. Place the new filter into position behind the spring. Install a new washer-type gasket on the fuel inlet filter nut and tighten the nut into the carburetor. Hold the fuel inlet nut securely with a wrench while the fuel line is connected. Plug the vacuum hose which leads to the air cleaner snorkel motor so the engine can be run. Start the engine and check for leaks. If the fuel line connector leaks, disconnect it and check for stripped or damaged threads. If necessary, use thread sealing tape or an inlet repair kit. Finally, reinstall the air cleaner assembly, connecting all hoses to their original positions.

Relieve the fuel system pressure. Raise the vehicle and support it securely on jackstands. Unscrew the fuel line-to-fuel filter fittings. Use a back-up wrench on the fuel filter side of the fitting; use a flare-nut wrench to unscrew the outer nut. Use a back-up wrench to keep from twisting the line. If the car is equipped with plastic "quick-connect" fittings, squeeze the tabs on the fitting and pull it apart. If the car is equipped with metal quick-connect fittings, pull back the rubber boot and twist the fitting one-quarter turn to loosen any dirt. Then, if compressed air is available, blow the dirt away from the connection. Use a special fuel line separator tool to disconnect the fitting. Remove the filter from the clip. Snap the new filter securely into the clip. Make sure the arrow on the filter points toward the engine. Using new O-rings, reattach the fuel lines to the filter. Apply a few drops of clean engine oil to the O-rings to ease reassembly.

The fuel filter is integral with the fuel pump module and is designed to last the life of the vehicle, so no service is required.

Make sure the lockout feature is turned off.