GM Corvette 1963-1982 Repair Guide

Electric Fuel Pump

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An electric, impeller-type fuel pump is used on all 1982 Corvettes. The pump is designed to deliver a constant flow of fuel to the throttle body fuel injection units. The fuel pressure is regulated at the pressure regulator and compensator units, both of which are integrated with the throttle body injection units.

The pump is mounted inside the fuel tank as part of the fuel gauge sending unit. The pump can be replaced independently of the sending unit.

TESTING



See Figure 1

Click image to see an enlarged view

Fig. Fig. 1: View of the special fuel gauge needed to test the fuel pressure on 1982 vehicles with Throttle Body fuel Injection (TBI)

A special fuel pressure gauge (Kent-Moore J-29658) is required to safely perform this test.

  1. Remove the air cleaner assembly and plug the vacuum connection(s) at the TBI unit.
  2.  
  3. Remove the fuel tube which connects between both TBI units.
  4.  

Use two line wrenches of the appropriate sizes to disconnect each fitting; one wrench to hold the large fitting, the other to loosen the smaller fitting.


CAUTION
A small amount of fuel will be released from the connections.

  1. Install the fuel pressure gauge between the two TBI units.
  2.  
  3. Turn the ignition switch ON and check for fuel leakage at the gauge arrangement. If leakage is noted, turn the ignition switch OFF and correct the leak.
  4.  
  5. Start the engine and read the fuel pressure on the gauge. Fuel pressure should be 9-13 psi. Turn the engine OFF. Replace the fuel pump if the pressure is not within this range.
  6.  
  7. Remove the fuel pressure gauge, install the fuel tube assembly, and check for leaks.
  8.  
  9. Reinstall the air cleaner and connect the vacuum lines as originally connected.
  10.  

REMOVAL & INSTALLATION



See Figure 2

Click image to see an enlarged view

Fig. Fig. 2: On 1982 vehicles, the electric fuel pump and gauge sender assembly are mounted in the gas tank

  1. Disconnect the battery cables at the battery.
  2.  
  3. Remove the fuel filler door and bezel.
  4.  
  5. Remove the fuel filler neck seal and drain hose.
  6.  
  7. Disconnect the lines and electrical connectors from the sending unit/pump assembly, and remove the screws which retain the assembly.
  8.  
  9. Remove the sending unit/pump assembly and the gasket.
  10.  
  11. Separate the pump from the sending unit.
  12.  
  13. Installation is the reverse of the previous steps. DO NOT connect the battery until all other steps have been completed.
  14.  

 
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