GM Firebird 1967-1981 Repair Guide

Fuel Filter

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See Figures 1 and 2

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Fig. Fig. 1: Make sure to use a new gasket when installing the fuel filter in the carburetor



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Fig. Fig. 2: Loosen the 2 hose clamps, then pull the inline filter out of the rubber fuel hoses

The carburetor inlet fuel filter should be replaced every 12,000 miles (15,000 miles for 1975 and later models) or more often if necessary.

Two types of fuel filters are used in the carburetor body, a bronze type and a paper element type. Either one may be encountered at any given time. However, the replacement filter should be of the same type as the one removed.

Inline fuel filters may be used on some engines and should be changed at the same time as the filter in the carburetor body.

Filter replacement should be attempted only when the engine is cold. Additionally, it is a good idea to place some absorbent rags under the fuel fittings to catch the gasoline which will spill out when the lines are loosened. To replace the filter found in the carburetor body:

  1. Detach the fuel line connection at the intake fuel filter nut. Plug the opening to prevent loss of fuel.
  2.  
  3. Remove the intake fuel filter nut from the carburetor with a 1 in. box wrench or socket.
  4.  
  5. Remove the filter element and spring.
  6.  
  7. Check the element for restrictions by blowing on the cone end. Air should pass freely.
  8.  
  9. Clean or replace the element, as necessary.
  10.  

To install:
  1. Install the element spring, then the filter element in the carburetor. Bronze filters should have the small section of the cone facing out.
  2.  
  3. Install a new gasket on the intake fuel nut. Install the nut in the carburetor body and tighten securely.
  4.  
  5. Install the fuel line and tighten the connector.
  6.  

Some models may have an inline filter. This is a can-shaped device located in the fuel line between the pump and the carburetor. It may be made of either plastic or metal. To replace the filter:

  1. Place some absorbent rags under the filter; remember, it will be full of gasoline when removed.
  2.  
  3. Use a pair of pliers to expand the clamp on one end of the filter, then slide the clamp down past the point to which the filter pipe extends in the rubber hose. Do the same with the other clamp.
  4.  
  5. Gently twist and pull the hoses free of the filter pipes. Remove and discard the old filter.
  6.  
  7. Install the new filter into the hoses, slide the clamps back into place, and check for leaks with the engine idling.
  8.  

 
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