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  • Leaking HPR

    I just purchased a 00 Cavalier with 114K miles. Every once in a while it leaks a liquid substance onto my driveway. I climbed under my car and noticed that it was leaking from the HPR valve. Is this normal?

    If this forum allows pictures, I've attached them below?

    Thanks for any help.

    http://www.xmission.com/~mabeck130/Images/cng1.jpg

    http://www.xmission.com/~mabeck130/Images/cng2.jpg
    Attached Files

  • #2
    Re: Leaking HPR

    cast_n_blast,

    Is the leaking liquid substance anitfreeze? That is the only liquid substance I can think of. Antifreeze is ran through the HPR to prevent the HPR from freezing up due to the drop in pressure from 3600 psi to 150 psi. When dealing with a gas, when you drop in pressure you drop in temeprature (Ideal Gas Law).
    Jared.
    Mountain Green, Utah
    2003 CNG Cavalier
    2003 CNG Silverado 2500HD

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    • #3
      Re: Leaking HPR

      I wasn't sure what it was until I climbed under the vehicle and noticed it was antifreeze. I couldn't figure out why I had antifreeze that far back, until I found out how the HPR works.

      It doesn't drip all the time, just every once in a while, should I replace the HPR?

      I keep checking my antifreeze level and it is still full.

      Thanks,

      Matt

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