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I lost capacity in my tanks by 80% suddenly?

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  • I lost capacity in my tanks by 80% suddenly?

    I have drove a 1996 Ford F259 dual fuel gas and natural gas for about a year now I know that on a good day I can get 15 gallons of cng in my two tanks the last 3 fills I have run it completely empty of cng and can only get 3 gallons in both tanks I am stumped on this one can you help me out. It has manual valvles on the tanks and they are open I am unaware of anything electrical between the fill nipple and the tanks. What is happening does not seem possible.

  • #2
    Re: I lost capacity in my tanks by 80% suddenly?

    Fordbifuelguy,
    A little more info please.

    When you topped it off with CNG, how far do you get before it switches over or you "run it completely empty of cng "?

    Are you saying it's out of CNG because it switches to gas or because the fuel gauge says so?

    Is this a compuvalve system?
    Your Friendly Nazi Squirrel Administrator

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