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P0440 help 01 Z28

This is a discussion on P0440 help 01 Z28 within the Computer & Tuning forums, part of the LSx Technical Help Section category; Here's what I have so far: 1. new gas cap. 2. code cleared (removed fuses). 3. code returned. 4. intermittent, ...

  1. #1
    Junior Member Corvettejon's Avatar
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    2001 Z28

    Question P0440 help 01 Z28

    Here's what I have so far:
    1. new gas cap.
    2. code cleared (removed fuses).
    3. code returned.
    4. intermittent, inability to fuel car (gas just sprays back out).
    5. removed gas filler neck, pushed on check valve, pressure released from tank.
    6. now able to fill car with gas.

    Appears that pressure in gas tank is keeping check valve sealed even when car is off. I would assume that the Evap. Canister or its vacuum lines are the culprit.

    Suggestions on which to check first.

  2. #2
    Senior Member mrr23's Avatar
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    Jul 2005
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    orlando, fl
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    7,134

    dark bowling green
    2000 corvette

    the EVAP canister could be bad.

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