How to Check for Fuel Delivery in a Nissan Pathfinder

Written by ehow cars editor
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The Nissan Pathfinder debuted in 1986 as a subcompact sport utility vehicle and shifted classes to a midsize SUV in 2005. Facelifts occurred in 2000, 2002, 2003 and 2008. The Pathfinder was known in markets outside the United States as the Terrano until 2005 when the Pathfinder name went international.

Skill level:
Moderately Challenging

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  1. 1

    Check the fuel delivery system of a Nissan Pathfinder if the engine won't start, if it runs rough or stalls out in traffic.

  2. 2

    Relieve the pressure in the fuel system. Disengage the fuel pump fuse. Start the engine and let it run until it stalls. Turn the ignition to the off position and disconnect the negative battery cable.

  3. 3

    Disconnect the fuel pressure sensor vacuum hose. Check for fuel in the line. If there is fuel present in the line, the fuel delivery problem is likely caused by a faulty fuel pump pressure regulator. If there is no fuel in the line, reattach the vacuum hose and continue with the fuel delivery diagnostic.

  4. 4

    Twist off the fuel pressure test port cap and attach a pressure gauge between the fuel tube and filter outlet using a "T" connector. Reconnect the negative battery cable and start the engine. Check the gauge. It needs to register approximately 33 psi. Disconnect the vacuum hose and check the gauge again. It needs to register approximately 43 psi. Pressure that's too high indicates a malfunctioning pressure regulator. A low pressure indicates a clogged fuel filter or a broken fuel pump that needs to be replaced.

  5. 5

    Cut the engine, relieve system pressure again and remove the negative battery cable.

  6. 6

    Remove the fuel pump and filter combination assembly. Detach the filter hose from the fuel tank and disconnecting the vent pipe, EVAP hose, shield for the fuel tank and the drive shaft. Use a jack to hold up the fuel tank as you unfasten the strap bolts and remove the tank. Disconnect all hoses and electrical connections to the fuel pump. Use a J-45722 tool to unfasten the locking ring that holds the fuel pump. Remove the pump.

  7. 7

    Examine the fuel filter for clogs and replace it with a new one if necessary. If there are no clogs, the fuel delivery problem is probably caused by a faulty fuel pump.

Tips and warnings

  • Don't operate the fuel pump for more than a couple seconds if you connect the fuel pressure gauge to the fuel system without a "T" connector. Using the fuel pump any longer will damage it.

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