Dodge Omni/Horizon/Rampage 1978-1989 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 Engines
1978-79 MODELS

The fuel filter on the 1978-79 models is located behind the fuel inlet of the carburetor. Under normal operating conditions the filter should be replaced every 15,000 miles (24,139 km).

  1. Remove the clamp from the rubber hose.
  2.  



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Fig. Fig. 1 On 1978-79 carbureted engines, the fuel filter is located behind this fitting

  1. Spread some dry rags under the fuel filter to absorb the inevitable gasoline spillage.
  2.  
  3. Unscrew the fitting and remove the filter.
  4.  

To install:

  1. Install a new filter.
  2.  



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Fig. Fig. 2 Check the rubber hose for damage

  1. Install and tighten the fitting.
  2.  
  3. Connect the fuel line. You may want to use a new screw type clamp that will make future filter replacement easier.
  4.  
  5. Run the engine and check for leaks.
  6.  

1980 AND LATER

There are two fuel filters in this system. One is part of the gauge unit assembly located inside the fuel tank on the suction end of the tube. This filter normally does not need servicing, but may be replaced or cleaned if a very large amount of extremely coarse material gets into the tank and clogs it.



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Fig. Fig. 3 Remove the hose clamps at both ends of the filter



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Fig. Fig. 4 Separate the hose ends from the fuel pipe lines

The 2.2 liter engine usually uses a disposable filter-vapor separator that is located on the front side of the engine block between the fuel pump and carburetor. On some applications, this filter has not only inlet and outlet connections, but a third connection designed to permit fuel to return to the tank so that vapor that accumulates in hot weather will not interfere with carburetion.

A plugged fuel filter can limit the speed at which a vehicle can be driven and may cause hard starting. The most critical symptom will usually be suddenly reduced engine performance at maximum engine power levels, as when passing.



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Fig. Fig. 5 Fuel will spill out, have a rag handy

  1. Have a rag ready to catch spilled fuel. Make sure the engine is cool.
  2.  
  3. Remove the hose clamps from each end of the filter. Then, disconnect the hoses, collecting the fuel in the rag.
  4.  
  5. Remove the old filter and hoses. On the reservoir type filter, remove the two mounting nuts inside the air cleaner.
  6.  

To install:

  1. Put the new filter into position. If it has mounting studs, pass them through the mounting bracket and then install the attaching nuts snugly.
  2.  
  3. Connect the hoses, and install and tighten the hose clamps (if the hoses are hard to force onto the nipples, you can wet them inside just very slightly). Make sure the clamps are located a short distance away from the ends of the hoses and on the inside of the nipples located on the ends of the filter connections.
  4.  
  5. Start the engine and check for leaks.
  6.  

Fuel Injected Engines

CAUTION
Fuel injected engines use high pressure in their operation. This pressure is maintained through the action of check valves even when the engine is off. Therefore, you must be sure to work on the fuel carrying parts of injected cars only when the engine has cooled off and only after you have properly bled the pressurized fuel from the system. Failure to do this could readily cause a fire!



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Fig. Fig. 6 Fuel injected engines use a canister type filter

  1. Relieve fuel system pressure as follows:
  2.  
    1. Loosen the fuel tank cap to release any accumulated air pressure that may be there. Then, disconnect the electrical connector at the single fuel injector on the throttle body on cars with throttle body injection. On cars with multi-point injection, disconnect the electrical connector on the injector closest to the battery.
    2.  
    3. Use a jumper wire to ground one of the injector terminals for whichever injector you've disconnected.
    4.  
    5. Connect one end of a jumper wire to the other injector terminal. Then, just touch the other end of the second jumper to the battery positive post for nearly 10 seconds.
    6.  
    7. Make sure you do not maintain this connection for more than the maximum of 10 seconds or the injector could be damaged.
    8.  

  3. Remove the retaining screw that mounts the filter to its retaining bracket so you can reach the hose clamps.
  4.  
  5. Then, loosen the clamps for both the inlet and outlet lines. Quickly wrap a shop towel around these connections to collect escaping fuel safely. Then, dispose of this towel in such a way as to protect it from heat the the chance of fire.
  6.  
  7. Note the routing of the hoses. The high pressure hose from the tank and pump goes to the inlet connection, which is always located toward the outer edge of the filter. The outlet hose to the engine is labeled on some filters and is always at the center. Pull the hoses off the connections on the filter. Replace the filter, draining fuel into a metal container and disposing of it safely. Inspect the hoses and clamps and replace defective parts as necessary.
  8.  


WARNING
Chrysler uses and recommends hoses that meet their specifications and are labeled EFM/EFI 18519. Make sure you use either this type of hose or an equivalent, high pressure (up to 55 psi) type of fuel hose available in the automotive aftermarket. Be sure not to use ordinary rubber fuel hose, as this is not tough enough for high pressure use and may not be able to resist the destruction caused by certain types of contamination. Also, if hose clamps require replacement, note that the original equipment clamps have rolled edges to keep the edge of the band from cutting into this hose, due to the necessary use of high clamping forces with a high pressure fuel system. Make sure that you use either an original equipment clamp or a similar type of clamp available in the aftermarket.

To install:

  1. Reconnect the hoses, using the proper routing noted as you disconnected them. You may want to very slightly wet the inside diameter of the hoses to make it easier to install them onto the filter connections. Install them as far as possible, until they are well over the bulges at the ends of the connectors. Install the clamps so they are a short distance away from the ends of the hoses but well over the bulged areas at the ends of the filter connections. Tighten both clamps securely tighten to 10 inch lbs. (1 Nm).
  2.  
  3. Remount the filter on the bracket snugly with the screw. Start the engine and check for leaks, tightening the hose clamps, replacing parts, or forcing the hoses farther onto the connectors, if necessary.
  4.  

 
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