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How come when I switch to gas into cng, and the gas is still running

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  • How come when I switch to gas into cng, and the gas is still running

    I got 1 issue that, today when I drive cng, and it still in haft tank of cng, and suddenly it drop down to empty, and it automatically switch gas, and so I went fuel it up, and it fuel only 2 gallon and it stop fueling, and I fuel it again and it stop at 2 gallon again, after I went turn on egnition, the tank is 3/4 tank, and I drove for 30 minutes with cng, but gas is running. Can someone help me please.

  • #2
    For starters , Make , year and model ? OEM or aftermarket bi fuel system ?


    • #3
      Sorry, I forgot to give detail, my truck 2014 ford f150


      • #4
        Which aftermarket CNG system is on the truck? There should be an emissions label under the hood placed there by the system provider (in addition to the Ford emissions label).