Question about 1990 Nissan 300ZX

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My 1990 300ZX has a "humming" sound from fuel pump area after shutting car off. Removing the fuel filler cap immediately stops the noise until the car cools down. Fuel temp sensor or fuel cap or hose??HELP???

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  • tkelly50 Jul 16, 2009

    Shop manual cited testing fuel cap for proper venting.
    Cap did not make clicking sound indicating proper valve operation, so new cap was installed.
    The condition appears to be heat or temperature related so tests wil continue. Could be collapsed or weak return line, fuel pump gasket leaking or as you say "anything".

  • tkelly50 Jul 20, 2009

    Jul 20,2009
    Removed access covers and checked lines for crimping.etc. Also changed fuel filler cap due to it failing shop manual indicated test. Cap is vented and supposed to draw air into tank to preclude vacuum caused by pressure. Clicking noise has apparently subsided with new cap- we'll see. Could be back if regulator, fuel temp sensor or other component. Car only has 37,000 miles but almost 20-years old!

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It could be anything from a wire short to the fuel pump going out, fuel pressure regulator, it could REALLY be about anything, to nothing at all

Posted on Jul 16, 2009

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  1. s3k~us~en~file=ani_caut.gif~gen~ref.gif WARNING: The fuel tank may be pressurized. Remove the fuel tank filler cap slowly. If a hissing sound is heard, wait until the condition stops before removing the fuel tank filler cap. If these precautions are not followed, fuel may spray and cause personal injury.
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  1. NOTE: Install a new fuel pump mounting gasket.
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Not a bad job. buy pump on ebay or new at discount at tascafordparts.com

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