Nissan Pick-ups and Pathfinder 1989-1995

Relieving Fuel System Pressure


See Figure 1

Never smoke when working around gasoline! Avoid all sources of sparks or ignition. Gasoline vapors are EXTREMELY volatile! Whenever you are working on or around the fuel system you should ALWAYS keep a dry chemical (Class B) fire extinguisher handy.

  1. There are various methods of relieving the fuel system pressure. All cause the engine fuel delivery system to purge itself while the engine is running by stopping the flow of additional fuel before stopping the engine. This may be accomplished in one or more of 3 possible methods, depending upon your vehicle. Perform one of the following while your engine is running:

    Remove the fuel pump fuse from the fuse block.
    Disconnect the fuel pump relay.
    Detach the wiring harness connector at the fuel tank.

  3. The vehicle should run and then stall when the fuel in the lines is exhausted. When the engine stops, crank the starter a few times for about 5 seconds to make sure all pressure in the fuel lines is released.

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Fig. Fig. 1: One method of releasing fuel pressure is to remove the fuel pump fuse with the engine running

  1. Install or engage the fuel pump fuse, relay or harness connector (as applicable) after the repair/replacement is made.
  3. The "Check Engine Light'' may stay on after the test has been completed. The trouble code in the control unit's memory must be erased. This may be done by disconnecting the battery cable for 10 seconds, then reconnecting it and verifying that the light has extinguished.