GM Buick/Oldsmobile/Pontiac/Full-Size 1975-1990 Repair Guide

Electric Fuel Pump

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See Figure 1

REMOVAL & INSTALLATION



  1. Allow the fuel pressure to bleed off.
  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Raise the rear of the car and support it with jackstands. Make sure to block the front wheels.
  6.  
  7. Remove the fuel tank. Pleaser refer to the Fuel Tank procedure found later in this section.
  8.  
  9. Remove the fuel lever sending unit and pump assembly by turning the cam lock ring counterclockwise. Lift the assembly from the fuel tank and remove the fuel pump from the fuel lever sending unit
  10.  
  11. Pull the pump up into the attaching hose while pulling outward away from the bottom support. Take care to prevent damage to the rubber insulator and strainer during removal. After pump assembly is clear of the bottom support, pull pump assembly out of the rubber connector for removal.
  12.  

To install:
  1. Inspect the pump attaching hose for any signs of deterioration. Replace as necessary. Also check the rubber sound insulator at the bottom of the pump; replace if required.
  2.  
  3. Push fuel pump assembly into the attaching hose.
  4.  
  5. Install the fuel lever sending unit and pump assembly into the tank assembly. Use new O-ring during reassembly.
  6.  

Care should be taken not to fold over or twist the strainer when installing the sending unit as this will restrict fuel flow.

  1. Install the cam lock over the assembly and lock by turning clockwise.
  2.  
  3. Reverse fuel tank removal procedure to finish installing.
  4.  



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Fig. Fig. 1: In-tank fuel pump

TESTING



Flow Test
  1. Allow the fuel pressure to bleed off.
  2.  
  3. Disconnect the fuel feed line and install a hose on the line.
  4.  
  5. Apply battery voltage (using a fused jumper wire) to terminal "G" of the Assembly Line Date Link (ALDL) connector located under the dash. Terminal "G" is the first terminal on the left of the bottom row.
  6.  
  7. The fuel pump should supply 1 / 2 pint or more in 15 seconds.
  8.  

Pressure Test
  1. Allow the fuel pressure to bleed off.
  2.  
  3. Obtain two sections 3 / 8 in. steel tubing. Each should be about 10 in. (254mm) long. Double-flare one end of each section.
  4.  
  5. Install a flare nut on each section. Connect each of the above sections of tubing into the "flare nut-to-flare nut adapters" that are included in the J-29658-82 Gage Adapters.
  6.  
  7. Attach the pipe and adapter assemblies to the J-29658 gage.
  8.  
  9. Using proper procedures, raise and support the front of the car.
  10.  
  11. Disconnect the front fuel feed hose from the fuel pipe on the body.
  12.  
  13. Install the 10 in. (254 mm) length of 3 / 8 in. fuel hose onto the fuel feed pipe on the body. Attach the other end of the hose onto one of the sections of pipe mentioned earlier. Secure the hose connections with clamps.
  14.  
  15. Attach the front fuel feed hose onto the other section of tubing. Secure the hose connection with a clamp.
  16.  
  17. Start the engine and check for leaks.
  18.  
  19. Observe the fuel pressure reading. It should be 9-13 psi (62-90 kPa).
  20.  

 
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