There are three different types of fuel filters that may be used on these vehicles: internal filter, in-line filter and in-tank filter.
The internal filter is used on all carburetors and is located in the inlet fitting. A spring is installed behind the filter to hold the filter outward, sealing it against the inlet fitting. A check valve is also built into the fuel filter element.
The in-line fuel filter is just that, installed in the fuel tank-to-engine fuel line, usually mounted on the rear crossmember of the Firebird.
The in-tank fuel filter is located on the lower end of the fuel pickup tube in the fuel tank. The filter is made of woven plastic and prevents dirt from entering the fuel line and also stops water, unless the filter becomes completely submerged in the water. This filter is self-cleaning and normally requires no maintenance.
REMOVAL & INSTALLATION
Internal Filter-Carbureted Engine
See Figure 1
- Remove the air cleaner assembly. Disconnect the fuel line connection at the fuel inlet filter nut.
- Remove the fuel inlet nut from the carburetor.
- Remove the fuel filter and spring.
- To install, replace the fuel filter.
The fuel filter has a built in check valve; and must be installed with the check valve to meet with safety standards in the event the vehicle is rolled over.
- Install the fuel inlet filter spring, filter and check valve assembly in carburetor. The check valve end of filter should faces toward the fuel line. The ribs on the closed end of the filter element will prevent the filter from being installed incorrectly unless it is forced.
- Install the nut in the carburetor and tighten nut to 46 ft. lbs. (62 Nm).
- Install the fuel line and tighten the connection.
- Start the engine and check for leaks. Install the air cleaner assembly.
In-line Filter-Fuel Injected Vehicles
See Figures 2 and 3
Release the fuel system pressure as follows:
- Remove the fuel pump fuse from the fuse block.
- Start the engine. Allow it to run out of fuel.
- Engage starter to make sure it is out of fuel.
- Turn the car off. Replace the fuse.
- Using two wrenches, hold the wrench on the fuel filter stationary while loosening the fuel line nut with the other wrench.
- Repeat Step 2 on the other side of the fuel filter.
- Loosen the fuel filter bracket screw and remove the fuel filter and O-rings.
- To install, make sure that the O-rings are good. If not, replace them.
- Slide the fuel filter into the bracket making sure of the filter fuel flow direction is correct.
- Install O-rings and the fuel lines.
- Using two wrenches, torque the fittings to 22 ft. lbs. (30 Nm).
- Turn the ignition switch ON to prime the fuel system and check for leaks.