Honda Civic/CRX/del Sol 1984-1995 Repair Guide

Mechanical Fuel Pump

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See Figures 1 and 2

REMOVAL & INSTALLATION



The fuel pump is located on the passengers side of the engine towards the front of the car.



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Fig. Fig. 1: Fuel system component layout-carbureted models



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Fig. Fig. 2: Mechanical fuel pump assembly mounting-carbureted models

  1. Disconnect the negative battery cable. Remove the fuel pump cover.
  2.  
  3. Clamp the fuel lines closed with fuel line clamps or equivalent, to prevent fuel from running out. Wrap a rag around the fuel lines and disconnect them from the fuel pump.
  4.  

When disconnecting the fuel lines, twist and slide them off to avoid damage.

  1. Remove the fuel pump retaining bolts and remove the pump from the engine.
  2.  

To Install:
  1. Clean the gasket mating surfaces and using a new gasket, install the fuel pump in position on the block.
  2.  
  3. Tighten the fuel pump retaining bolts to 17 ft. lbs. (24 Nm).
  4.  
  5. Reconnect the fuel lines and make sure that they are tightly clamped. Do not over tighten the clamps or you will damage the hoses.
  6.  
  7. Connect the negative battery cable and start the vehicle. Check for leaks at the fuel pump.
  8.  

TESTING



See Figures 3 and 4

  1. Check the following items:
    1. Looseness of the pump connector.
    2.  
    3. Looseness of the upper or lower body and cover screws.
    4.  
    5. Looseness of the rocker arm pin.
    6.  
    7. Contamination or clogging of the air hole.
    8.  
    9. Improper operation of the pump.

      Click image to see an enlarged view

      Fig. Fig. 3: Fuel pump pressure test using a pressure gauge



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      Fig. Fig. 4: Fuel pump output test using a graduated container

    10.  

  2.  
  3. Check to see if there are signs of oil or fuel around the air hole. If so, the diaphragm is damaged and you must replace the pump.
  4.  
  5. Disconnect the fuel line to the fuel filter, in the engine compartment and connect a fuel pressure gauge to it.
  6.  
  7. Disconnect and plug the fuel return line at the fuel pump.
  8.  
  9. Start the engine and allow it to idle until the fuel pressure stabilizes, then shut the engine OFF .
  10.  
  11. The fuel pressure gauge should read 2.7-3.8 psi. (17.7-26.5 kPa) at idle. If the gauge reads at least 2.7 psi (17.7 kPa), then go on to Step 7, if the gauge reads less than 2.7 psi. (17.7 kPa), the fuel pump must be replaced.
  12.  
  13. Remove the pressure gauge and place a graduated glass container under the fuel hose.
  14.  
  15. Start the engine and allow the car to idle for exactly 60 seconds, then shut the engine OFF .
  16.  
  17. The fuel volume pumped into the container should be 5.7 oz. (170cc) or more, if the volume was less than 5.7 oz. (170cc), replace the pump.
  18.  

Check for a clogged fuel filter or fuel line and for a pinched fuel line before replacing the fuel pump.

 
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