Chrysler Full-Size Trucks 1967-1988 Repair Guide

Fuel Filter

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CAUTION
Never smoke when working around gasoline! Avoid all sources of sparks or ignition. Gasoline vapors are EXTREMELY volatile!

REMOVAL & INSTALLATION



Carbureted Gasoline Engines
CANISTER TYPE

Some 1967-78 models had a cartridge type filter enclosed in a canister located in the fuel line. To replace the filter, unscrew the body of the canister, discard the gasoline safely and install a new cartridge. Screw the canister body on securely.

THROW-AWAY TYPE

See Figures 1, 2 and 3

On some 1967-78 vehicles and all carbureted models thereafter, the fuel filter is a disposable type sealed paper element located in the fuel line.

On 1967 models, the filter is located in the line just before it enters the carburetor. In all other years, it is located in the line near the fuel pump. Later models also have another filter located on the fuel tank in the end of the fuel suction tube. This filter does not normally require service, although it is replaceable.

  1. Remove the hose clamps on the fuel filter.
  2.  

Make sure to wrap a shop towel around the filter before removal in order to absorb any fuel spillage.

  1. Remove the filter and discard.
  2.  
  3. Inspect all hoses leading to the filter for any cracks or damage. If they are damaged replace them immediately. Never put a cracked or damaged hose back on, this could cause a fire.
  4.  

To install:
  1. Replace the fuel filter with new hose clamps, making sure they are tight and secure.
  2.  
  3. Be sure none of the fuel hoses are kinked or pinched in route to the filter. This could cause poor fuel distribution. Also check for fuel lines touching any heat surfaces.
  4.  
  5. Start engine, and check for leaks!
  6.  



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Fig. Fig. 1: In-line fuel filter



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Fig. Fig. 2: Use pliers to loosen clamps



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Fig. Fig. 3: Fuel filter location for fuel injected engines

Position a container to catch and spilled fuel.

Fuel Injected Gasoline Engines

The fuel filter is located in the fuel line on the inside of the left frame rail, just ahead of the crossmember. To change the filter:

  1. Relieve the fuel system pressure as described in Fuel System .
  2.  
  3. Remove the filter retaining screw and remove the filter from the frame rail.
  4.  
  5. Wrap a shop towel around the hose connections to catch fuel spillage. Loosen the fuel hose clamps and disconnect the hoses from the filter.
  6.  
  7. Remove old fuel filter and replace it with a new one.
  8.  
  9. Connect the fuel hoses and tighten hose clamps. Position the filter on frame rail and tighten the retaining screw to 75 inch lbs. (8.4 Nm).
  10.  

Diesel Engines

See Figures 4 and 5

A gauze filter, located at the inlet port of the fuel feed pump, is designed to catch large particles of dirt in the fuel line. This filter must be cleaned every 12,000 miles (19,000 km) in kerosene. This system also uses another in-line fuel filter, which must be inspected every 12,000 miles (19,000 km). Replace the in-line filter element if it appears dirty or clogged. It should also be replaced at least every 24,000 miles (38,600 km).



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Fig. Fig. 4: Cutaway view of a diesel fuel filter



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Fig. Fig. 5: Diesel fuel feed pump gauze filter

  1. Loosen the air plug at the top of the fuel filter. Remove the plug or open the draincock at the bottom and allow fuel to drain.
  2.  
  3. Remove the center bolt and separate the case from the cover.
  4.  
  5. Inspect the paper element for sediment buildup, if it appears clogged, replace it.
  6.  
  7. Clean the inside of the case thoroughly before installing the new element.
  8.  

To install:
  1. Install a new cover gasket "O-ring'', reassemble the case to the cover.
  2.  
  3. Reinstall drain plug or close the draincock.
  4.  
  5. Bleed air from the system before starting vehicle.
  6.  

 
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