The mechanical fuel pump is located on the right front of the engine.
REMOVAL & INSTALLATION
- Disconnect the negative battery cable, the fuel inlet hose from the fuel pump and the vapor return hose (if equipped).
- Disconnect the fuel outlet hose from the fuel pump.
- Remove the fuel pump-to-engine bolts, the fuel pump, the pushrod, the gasket and the mounting plate.
- Using a putty knife, clean the gasket mounting surfaces.
- Use a new gasket with silicone sealer.
- Install the mounting plate, gasket, pushrod and fuel pump. Torque the mounting bolts to 27 ft. lbs. (37 Nm).
- Connect the fuel outlet hose to the fuel pump.
- Connect the fuel inlet hose to the fuel pump and the vapor return hose (if equipped).
- Connect the negative battery cable, start the engine and check for fuel leaks.
- Remove the fuel pump-to-carburetor line from the carburetor.
- Place the fuel line into a clean container.
- Crank the engine; approximately 1 / 2 pint of the fuel should be delivered in 15 seconds.
- If the fuel flow is below minimum, inspect the fuel system for restrictions; if no restrictions are found, replace the fuel pump.
The following procedure requires the use of a GM Fuel Pressure Gauge tool No. J-29658-A or equivalent.
- Remove the air cleaner, then disconnect and plug the THERMAC vacuum port on the carburetor.
- Place a rag (to catch excess fuel) under the fuel line-to-carburetor connection. Disconnect the fuel line from the carburetor.
When disconnecting the fuel line, use a back-up wrench to hold the fuel nut on the carburetor.
- Using a GM Fuel Pressure Gauge tool No. J-29658-A or equivalent, install it into the fuel line.
- Start the engine and observe the fuel pressure. The pressure should be 4-6.5 psi (27.5-44.9 kPa).
If the fuel pressure does not meet specifications, inspect the fuel system for restrictions or replace the fuel pump.
- Stop the engine, relieve the fuel pressure and remove the GM Fuel Pressure Gauge tool No. J-29658-A or equivalent.
- Install a new fuel line-to-carburetor O-ring or washer. Unplug the THERMAC vacuum port. Start the engine and check for fuel leaks.