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Thread: P0456 - very small EVAP leak

  1. #11
    NostraJackAss Jack@European_Parts's Avatar
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    OK, I believe I understand. This (pressure) test will tell me if the pump I installed is doing its job as far as pressurizing the gas tank for leaks etc...


    Affirmative but the vacuum pump on the engine or auxiliary vacuum pump if supported, "if deficient" for supplied vacuum can cause this LDP pump to not function properly.

    A good test is to crimp off the N80 and use a mechanical pump such as a mighty vac to supply the LDP with sufficient monitored vacuum.





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  3. #12
    NostraJackAss Jack@European_Parts's Avatar
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    Oh and I am willing to bet that your LDP was not bad ............I have yet to find a bad one as tested, unless due to collision damage.
    European Parts Emporium/Performance / Immobilizer Solutions EPE
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  4. #13
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    I replaced it because when I ran a smoke test it was leaking.
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  5. #14
    NostraJackAss Jack@European_Parts's Avatar
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    I replaced it because when I ran a smoke test it was leaking.

    I'm interested..........
    Please explain how the smoke test was done and how it showed evidence of a failure of the LDP?
    What failed exactly?

    European Parts Emporium/Performance / Immobilizer Solutions EPE
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  6. #15
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    Connected a smoke machine in the engine compartment area. Ran the machine and smoke leaked out of the LDP.
    __________________________________________________ _____
    Remember, Today is the Tomorrow you worried about Yesterday!

    Otto

  7. #16
    NostraJackAss Jack@European_Parts's Avatar
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    Connected a smoke machine in the engine compartment area. Ran the machine and smoke leaked out of the LDP.

    Interesting.........



    Where did smoke come out on LDP .......the filter, the reed, a line, pump diaphragm or the case being cracked?

    Any pictures of old unit and verified damage?

    What line under hood did you use to inject smoke and was it under PSI or just static distribution?
    Last edited by Jack@European_Parts; 11-23-2017 at 08:57 AM.
    European Parts Emporium/Performance / Immobilizer Solutions EPE
    Certified Master Trained NY/BAR/BAD 7076062/ASE/SAE/NASTF Legal Factory Authorized/Licensed GeKo/FaZit # 403738
    Specializing in Custom Services IE: "welding-fabrication" / EPA-SMOG Update or Pass-Thru-Programming / Data Transfer / Immobilizers & OEM Quality Parts
    Above Magic! No Written record, AUTO-SCAN or Appointment = NO HELP!
    www.FixMyEuro.com <<<<<CLICK HERE! or vwemporium@aol.com ( JPPSG & Unverified members need not PM me & Please don't email or call facility for free tech support...use the forum )
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  8. #17
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    On the LDP - it was leaking from the pump filter.
    __________________________________________________ _____
    Remember, Today is the Tomorrow you worried about Yesterday!

    Otto

  9. #18
    NostraJackAss Jack@European_Parts's Avatar
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    On the LDP - it was leaking from the pump filter.
    Than there was nothing wrong with your old LDP.

    Thank you for this confirmation.
    European Parts Emporium/Performance / Immobilizer Solutions EPE
    Certified Master Trained NY/BAR/BAD 7076062/ASE/SAE/NASTF Legal Factory Authorized/Licensed GeKo/FaZit # 403738
    Specializing in Custom Services IE: "welding-fabrication" / EPA-SMOG Update or Pass-Thru-Programming / Data Transfer / Immobilizers & OEM Quality Parts
    Above Magic! No Written record, AUTO-SCAN or Appointment = NO HELP!
    www.FixMyEuro.com <<<<<CLICK HERE! or vwemporium@aol.com ( JPPSG & Unverified members need not PM me & Please don't email or call facility for free tech support...use the forum )
    Getting you CONTROL again of your property - TAKE IT! In Conjunction with.........

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