Chevrolet Blazer/Jimmy 1969-1982 Repair Guide

Fuel Filter

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REMOVAL & INSTALLATION



Gasoline Engine


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Fig. Fig. 1 Unfasten the large nut and remove the fuel filter from the carburetor



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Fig. Fig. 2 To remove the fuel filter, use a back-up wrench to hold the large nut and loosen the fuel line nut ...



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Fig. Fig. 3 ... then move the fuel line to one side and withdraw the filter assembly



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Fig. Fig. 4 Remove the filter and then the spring from the large nut

A clogged filter can cause the engine to die out on acceleration or at high speeds. All engines have the filter in the carburetor fuel inlet.

  1. Let the engine cool.
  2.  
  3. Remove the air cleaner for access.
  4.  
  5. Place an absorbent rag under the fuel line connection.
  6.  
  7. Hold the large nut to keep it from turning. Unscrew the small fuel line nut, preferably with a special line flare wrench.
  8.  
  9. Move the fuel line aside and unscrew the large nut, being careful to catch the filter and spring.
  10.  
  11. If you want to, you can test the old filter by blowing through it. Air should pass freely. Most engines have a paper filter, but a few older ones have a bronze unit.
  12.  

To install:

  1. Insert the spring, then the filter, with the opening toward the fuel line.
  2.  
  3. Screw in the large nut and tighten it gently.
  4.  

Repair kits are available at auto parts stores, if the carburetor threads are damaged.

  1. Screw in the fuel line nut and tighten gently.
  2.  
  3. Remove and safely discard the rag.
  4.  
  5. Start the engine and check for leaks. Stop the engine and replace the air cleaner.
  6.  

Diesel Engine

This engine uses two fuel filters; a primary, located on the firewall, and a secondary, mounted on the inlet manifold.

Both the primary and secondary fuel filters are serviced in the same manner.

  1. Disconnect the inlet and outlet fuel lines at the adapter.
  2.  
  3. Unscrew mounting bolts and remove adapter from the inlet/firewall.
  4.  
  5. Unscrew filter from adapter.
  6.  

To install:

  1. Anytime either of the filters are removed or replaced, refill with clean diesel fuel to prevent stalling after start up, and to avoid long engine cranking time.
  2.  
  3. Screw the filter onto the adapter.
  4.  
  5. Remount the adapter and install the fuel lines.
  6.  
  7. Run engine and check for leaks.
  8.  

WATER DRAIN

Water can be drained from the primary fuel filter only.

  1. Open the petcock on top of the primary filter housing.
  2.  
  3. Place a drain pan below the filter and open the petcock on the bottom of the filter.
  4.  

A length of hose can be attached to the petcock to direct the drained fuel below the frame.

  1. When all water is drained, close both petcocks tightly. If all fuel in the filter has been drained, remove the filter and fill it with clean diesel fuel.
  2.  
  3. Start the engine and let it run briefly. It may run rough at first until all air is purged from the system. If roughness continues, check that both petcocks are closed tightly.
  4.  

 
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