Honda Accord/Prelude 1984-1995 Repair Guide

Electric Fuel Pump

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The carbureted Accords and Preludes covered in this information use an electric fuel pump located either near or inside the fuel tank. The 1984-85 Accords and 1984-87 Preludes use an external fuel pump mounted under the car just forward of the left rear wheel. Later models use an electric fuel pump mounted inside the fuel tank.

REMOVAL & INSTALLATION




CAUTION
Gasoline vapors are explosive. Remove components slowly and contain spillage. Observe "no smoking/no open flame" precautions. Have a Class B-C (dry powder) fire extinguisher within arm's reach at all times.

Externally Mounted Fuel Pump

See Figures 1 and 2

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the gas filler cap to relieve any excess pressure in the system.
  4.  
  5. Loosen the lug nuts of the left rear wheel.
  6.  
  7. Elevate the rear of the car and support it safely on properly placed stands. Remove the left rear wheel.
  8.  
  9. Use a pair of suitable fuel line clamps to pinch shut the fuel hoses leading to and from the pump.
  10.  



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Fig. Fig. 1: Accord external fuel pump

  1. Label the fuel lines, then loosen the hose clamps. Slide the clamps back; twist the hoses while removing them.
  2.  



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Fig. Fig. 2: External fuel pump used on Preludes

  1. Disconnect the positive lead wire and ground wire from the pump.
  2.  
  3. Remove the fuel pump retaining bolts, taking care not to lose the spacers and bolt collars.
  4.  
  5. Remove the fuel pump and its protective cover as a unit.
  6.  

The pump cannot be disassembled and must be replaced if defective.

To install:
  1. Install the fuel pump and cover. Make certain the mounting collars and insulators are in the proper location. Tighten the mounting bolts to 7 ft. lbs. (10 Nm).
  2.  
  3. Engage the wiring to the fuel pump.
  4.  
  5. Connect the fuel hoses, making certain the lines are correctly placed and the clamps are secure. When in doubt, use new clamps; they are cheap insurance against leaks. Remove the fuel line clamps.
  6.  
  7. Install the left rear wheel. Lower the car to the ground.
  8.  
  9. Install the fuel filler cap. Connect the negative battery cable.
  10.  
  11. Turn the ignition ON for 3 seconds, listening for the fuel pump operation. Switch the ignition OFF , then ON again. This will build pressure within the fuel lines.
  12.  
  13. Start the engine. It may crank for several seconds until the lines are completely filled.
  14.  

In-Tank Fuel Pumps

See Figure 3

  1. Disconnect the negative battery cable.
  2.  
  3. Lift or reposition the carpet in the luggage area. Remove the left access cover in the floor.
  4.  
  5. Unplug the electrical connector at the pump unit.
  6.  
  7. Label and disconnect the fuel lines.
  8.  
  9. Carefully remove the retaining nuts securing the pump. When all are removed, lift the pump up and out of the tank.
  10.  



Click image to see an enlarged view

Fig. Fig. 3: In-tank fuel pump used on Accords and Preludes

The pump may require some manipulation to remove.

To install:
  1. Install the pump, making certain it is correctly seated and not wedged or jammed. Install the retaining nuts, tightening them evenly and alternately to 4 ft. lbs. (6 Nm).
  2.  
  3. Connect the fuel lines. Make certain the clamps are secure; use new ones if necessary.
  4.  
  5. Engage the wiring to the fuel pump.
  6.  
  7. Install the access cover and seal or gasket, if used.
  8.  
  9. Reposition the carpeting in the luggage compartment.
  10.  
  11. Connect the negative battery cable.
  12.  
  13. Start the engine; it may crank longer than normal until fuel pressure is established.
  14.  

TESTING



See Figures 4 and 5

Always check the fuel filter for clogging and/or the fuel lines for crimping or blockage before testing the fuel pump. A fuel pressure gauge and a graduated quart container are required for these procedures.

Externally Mounted Fuel Pumps
  1. Turn the ignition OFF . Remove the screws securing the underdash fuse box to its mount. Remove the fuel cut-off relay from the back of the fuse block and turn the block so you can see the relay mount.
  2.  
  3. Use a jumper wire to connect the two left-most terminals of the relay mount. On Preludes, these terminals are for the Black/Yellow wires. On the Accord, they are designated Terminals 1 and 2.
  4.  
  5. Disconnect the fuel line at the fuel filter in the engine compartment. Connect a pressure gauge to the fuel line.
  6.  
  7. Turn the ignition key ON until pressure on the gauge stabilizes, then turn the key OFF .
  8.  
  9. Pressure should be between 2.4-3.1 psi (16.7-21.6 kPa) for Accords and 2-3 psi (13.6-20 kPa) for Preludes. If the pressure shown is below minimum, the pump must be replaced. If pressure is at least minimum, continue with the test.
  10.  
  11. Remove the pressure gauge from the fuel line; hold the line in the quart container. Have an assistant turn the ignition switch ON for 60 seconds, then turn it OFF .
  12.  
  13. Fuel flow in 60 seconds must be at least 17 oz. (500 cc) for Accord or 23 oz. (680 cc) for Prelude.
  14.  
  15. If fuel pump volume is below specification, the pump must be replaced.
  16.  
  17. Remove the jumper wire at the fuse block. Reinstall the fuel cut-off relay. Reinstall the fuse block on its mount.
  18.  



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Fig. Fig. 4: Fuel system pressure test



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Fig. Fig. 5: Fuel system volume test

In-Tank Fuel Pumps
  1. Turn the ignition OFF .
  2.  
  3. On the Accord, remove the screws securing the underdash fuse box to its mount. Remove the fuel cut-off relay from the back of the fuse block and turn the block so you can see the relay mount. Use a jumper wire to connect the two left-most terminals of the relay mount (terminal 1 to terminal 2).
  4.  
  5. On Preludes, remove the dashboard under cover; remove the fuel cut-off relay from the fuse block. Use a jumper wire to connect the top 2 terminals (terminals 1 and 2) of the relay mount.
  6.  
  7. Disconnect the fuel line at the fuel filter in the engine compartment. Connect a pressure gauge to the fuel line.
  8.  
  9. Turn the ignition key ON until pressure on the gauge stabilizes, then turn the key OFF .
  10.  
  11. Pressure should be between 2.6-3.3 psi (18-22.7 kPa). If the pressure shown is below minimum, the pump must be replaced. If pressure is at least minimum, continue with the test.
  12.  
  13. Remove the pressure gauge from the fuel line; hold the line in a quart container. Have an assistant turn the ignition switch ON for 60 seconds, then shut it OFF .
  14.  
  15. Fuel flow in 60 seconds must be at least 25.7 oz. (760 cc).
  16.  
  17. If fuel pump volume is below specification, the pump must be replaced.
  18.  
  19. Remove the jumper wire at the fuse block. Reinstall the fuel cut-off relay. Reinstall the fuse block on its mount.
  20.  

 
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