Isuzu Cars and Trucks 1981-1991

Relieving Fuel System Pressure


Carbureted Engine
  1. Release the fuel vapor pressure in the fuel tank by removing the fuel tank cap and reinstalling it.
  3. Cover the fuel line with an absorbent shop cloth and loosen the connection slowly to release the fuel pressure gradually.

Fuel Injected Engine
  1. Allow the engine to cool. Then, remove the fuel pump fuse from the fuse block or disconnect the fuel pump relay connector.
  3. Crank the engine, it will start and run until the fuel supply remaining in the fuel lines is exhausted. When the engine stops, engage the starter again for 3.0 seconds to assure dissipation of any remaining pressure.
  5. With the ignition OFF , replace the fuel pump fuse or connect the fuel pump relay.

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Fig. Fuel system pressure release late model EFI cars

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Fig. Fuel pump relay 1981 I-Mark with G180Z engine