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I've Got it my 00" K-2500 Chevy

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  • I've Got it my 00" K-2500 Chevy

    Silly question how do I know if my CNG system is working? There is a switch on the dash that is listed gasoline the light on the switch dose not light up. It is an IMPCO installation dose anyone know of a a certified tech shop in Salt Lake? Any feed back that is helpful would make me happy

  • #2
    Re: I've Got it my 00" K-2500 Chevy

    I believe this system is that same as the Cavaliers. Here is a basic rundown. The switch on the dashboard is only to check the level of the "other" fuel. If the light is lit, you are running on gasoline; if the light is not lit, you are running on CNG. If you are running on CNG (light is out) and you push the switch, the gauge will move to show the amount of gasoline you have. If you are running on gasoline (light is lit) and you push the switch, the gauge will move to show the amount of CNG you have. The fuel system is always defaulted to CNG. When the CNG runs out, the vehicle switches to gasoline (light comes on). When you start your vehicle, the light will come on and then go off - meaning that you running on CNG. If you start your vehicle and you are out of CNG, then the light will just stay on. You can NOT switch from CNG to gasoline and back to CNG by pushing the switch. That switch is only for checking the level of the "other" fuel. Hope this helps.
    Jared.
    Mountain Green, Utah
    2003 CNG Cavalier
    2003 CNG Silverado 2500HD

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    • #3
      Re: I've Got it my 00" K-2500 Chevy

      OK Jared thank you since there are no books with the truck light must be out. This is nice to know,as I have read yes this is the system that the Cavies use. So who works on them?

      Pete

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      • #4
        Re: I've Got it my 00" K-2500 Chevy

        Pete,

        There is one case that I know of when you could be using gasoline and the light be off. That is if the CNG fuse is burned out. If you suspect that you are running on gasoline and the light is off, check the fuse.

        As far as who works on them, I know that Young Chevrolet in Layton has CNG parts in stock. You can check the GM website for a list of authorized alternative fuel vehicle repair dealers in Utah. Young Chevrolet is one, and I believe there is one in Salt Lake. Sno-Motion has a lot of experience with the Cavaliers. You can also check the link below to a list of CNG service shops from this website.

        http://www.cngchat.com/forum/showthread.php?t=27
        Jared.
        Mountain Green, Utah
        2003 CNG Cavalier
        2003 CNG Silverado 2500HD

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        • #5
          Re: I've Got it my 00" K-2500 Chevy

          Jared thanks both of the fuse's are good I'll go get a new switch on Monday and go from there!

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          • #6
            Re: I've Got it my 00" K-2500 Chevy

            So you mean it's as simple as pulling a fuse when I want to switch from CNG over to the pulling power of gasoline when I want to tow my trailers?
            2003 GMC Sierra K2500 ex-cab, factory bi-fuel
            -Todd

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            • #7
              Re: I've Got it my 00" K-2500 Chevy

              Todd I you can try a fuse pull,the fuse's are located in the box under the hood. I haven't thought of that.It would shut the system down but the auto switch is pressure activated.

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              • #8
                Re: I've Got it my 00" K-2500 Chevy

                You can check to see if your car is running on cng by watching the fuel gage. Switch it to cng and drive it 50 miles or so and see what happens to the cng fuel gage. (Toggle the switch and hold it for a few minutes to change the fuel types on the fuel gage.) If still in question, fill up both your cng tank and your gas tank. Flip the switch to cng and drive a hundred miles or so. Then fill up both tanks again and see which tank has used the fuel.

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                • #9
                  Re: I've Got it my 00" K-2500 Chevy

                  There is a shop in North Salt Lake that works on CNG vehicles. They used to be called Sno-Motion. I think they have a new name, Go Natural. If you can't find them you can always take it to Ashton Motors in Ogden. We specialize in CNG vehicles. Our rate is $95 per hour.

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                  • #10
                    Re: I've Got it my 00" K-2500 Chevy

                    On the GM models with the IMPCO system it is CNG default you can not flip a switch to change fuels,when you run out of CNG it goes to gasoline.The only two ways Todd can pull in gasoline mode is to shut down the CNG by pulling a fuse or run the CNG tank empty.As far as I know and understand the system.

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                    • #11
                      Re: I've Got it my 00" K-2500 Chevy

                      I have an IMPCO system in my 2008 6.0L Silverado and it has a round control button with a light above that is red when running on gasoline and green on CNG. It defaults to CNG after the engine warms up on gasoline. If I press the button at anytime then it switches to gasoline, Another press and it is back to CNG. Very useful if I need sudden power to pass or climb a hill. The address for IMPCO on their user's guide is:
                      3030 S. Susan St, Santa Ana, CA 92705. Customer service # is 800-464-5870.

                      Semi Service in SLC installed the kit and I think they have experience with the older systems. 800-442-6687 and ask for the CNG dept.
                      Last edited by Nenty; 08-24-2008, 11:14 AM.

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