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HELP!! - Unhooked CNG System

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  • HELP!! - Unhooked CNG System

    I talked with a guy that has a 1999 Ford F250 bi-fuel but the CNG setup has been disconnected because where he lives they don't have public stations. He said that it runs perfectly on gas. It has a lot of miles on it (196K) but I think I can get a pretty good deal on it. My question is whether or not the CNG system will still work if it has been disconnected and gone unused for several years. I know I'll need to get a new tank for it, but will someone be able to hook it up and be good to go? Any help would be great!

  • #2
    Re: HELP!! - Unhooked CNG System

    I'm going to move this to the Ford forum for the experts to chime in over there.

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    • #3
      Re: HELP!! - Unhooked CNG System

      Thanks for moving this. Newbie mistake. To anyone that can offer advice, it would be greatly appreciated!!

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      • #4
        Re: HELP!! - Unhooked CNG System

        Its not worth anything! Give me the guy's contact information so I can let him know

        Seriously, I would imagine a compuvalve that did not see regular use has more probability of being bad, or failing. They are expensive. I would think everything else would be fine!

        I'm going to have a factory tank out of a CNG F150 in 2 weeks, prolly trying to get $1300 for it. Lemme know if your interested.

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        • #5
          Re: HELP!! - Unhooked CNG System

          Just a question for you to ask him that sounds a bit curious to me: why is the system disconnected if it runs on either fuel with a flick of a switch? I would bet that the compuvalve is bad and someone started to take it apart to fix and never finished.

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          • #6
            Re: HELP!! - Unhooked CNG System

            So I bought the truck. I was told the system wasn't disconnected, just the tank was pulled out of the truck do remove weight. Basically no CNG access in Atlanta for them. I took it to a Ford dealer to make sure it ran well before buying it. Since it didn't have the tank they couldn't check to make sure the CNG system worked. Bummmer, but for what I paid, it's a risk I'm willing to take.

            Follow up question for everyone. All the parts are in there still but have sat dormant for 3 years. If I get a tank and hook it up, can I just fill and test it? Do I need to take it somewhere to have the lines cleaned out or anything? I'm so excited to get rolling on CNG (especially since I just drove it Atlanta to SLC getting 15 MPG!!)

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            • #7
              Re: HELP!! - Unhooked CNG System

              I don't think they were capped, but it doesn't look like too much would be able to get in there. If I did want to flush out the lines before hooking up a tank, how would I do that? Any suggestions?

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              • #8
                Re: HELP!! - Unhooked CNG System

                Originally posted by Airliner View Post
                I don't think they were capped, but it doesn't look like too much would be able to get in there. If I did want to flush out the lines before hooking up a tank, how would I do that? Any suggestions?
                I would check with Champion Ford in Sandy and see what they could do to blow out the lines. Other than that you should could hook up your tank and run the cleaner through the sysetm once you get some cng flowing. Check the forums for a write up on that. Also try http://www.lincolncomposites.com/products.html for a tank.

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                • #9
                  Re: HELP!! - Unhooked CNG System

                  Cool. I'll call Champion Ford and see about flushing the system. In theory, I should be able to hook up a tank and just see if it works? Best case scenario it starts right up and runs for me. Here's to hoping!

                  On another subject, any suggestions on tanks? I hear there is some company in Brigham City starting up and selling 13 GGE tanks. I hear Lincoln Composites sells new tanks, but that they're pricey. I couldn't find price lists though.

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                  • #10
                    Re: HELP!! - Unhooked CNG System

                    Thinking more about it, this is what I would do. Disconnect your cng line before it connects to the filter, (that’s just under the bed, and easy to access) and blow it out with compressed air and change the filter. I think the only problem you would be looking at is a few bug nests up in the line. The filter would have blocked anything past that point.

                    Once your get your tank on and the truck runs, I would put new plugs, coils and o-rings on the cng injectors for a tune-up.

                    Yeah Lincoln Composites is going to be very expensive, but they have huge tanks. I saw a 24gge tank on a new gmc that snow-motion was converting; he said it was something like 4k just for the tank... I think your best option for finding a tank is on this forum, or try eBay.

                    Good luck hope it works out.

                    Comment


                    • #11
                      Re: HELP!! - Unhooked CNG System

                      Originally posted by Nilley View Post
                      Thinking more about it, this is what I would do. Disconnect your cng line before it connects to the filter, (that’s just under the bed, and easy to access) and blow it out with compressed air and change the filter. I think the only problem you would be looking at is a few bug nests up in the line. The filter would have blocked anything past that point.

                      Once your get your tank on and the truck runs, I would put new plugs, coils and o-rings on the cng injectors for a tune-up.

                      Yeah Lincoln Composites is going to be very expensive, but they have huge tanks. I saw a 24gge tank on a new gmc that snow-motion was converting; he said it was something like 4k just for the tank... I think your best option for finding a tank is on this forum, or try eBay.

                      Good luck hope it works out.
                      Cool, I will try that. You're saying I can get to that line just under the truck bed? That is the line that connects to the tank in the bed and then runs through a hole to the engine, right? Also, where would I pick up a new filter? Is that something they'd have at Autozone or will I need to special order that? Once I blow out that line, reconnect it and change the filter, it sounds like I should be good to hook up a tank and give it a try.

                      Even if it seems to work on cng (I'm praying the compuvalve isn't bad . . .) you would suggest changing all plugs, coils and o-rings to tune it up? Is that something that's easy to get to and do or am I better off taking it to a shop? I'm certainly no mechanic, but I don't mind getting in there and trying to take care of things if it's relatively straight forward.

                      Thank you so much for your help. This forum is so fantastic for info!

                      Comment


                      • #12
                        Re: HELP!! - Unhooked CNG System

                        Originally posted by Airliner View Post
                        ...you would suggest changing all plugs, coils and o-rings to tune it up? Is that something that's easy to get to and do or am I better off taking it to a shop? I'm certainly no mechanic, but I don't mind getting in there and trying to take care of things if it's relatively straight forward....
                        Getting at the plugs and coil packs on an F150 isn't easy and the CNG components make it that much harder. I'm not saying that you couldn't do it, but I will tell you that I do almost all of my own auto maintenance including swapping out engines, but I didn't go after the plugs/coil packs on my daughter's bi-fuel when it was time for a tune up.
                        2008 GX (extended range, trunkless version)
                        Polished Metal Metallic 2012 Civic Natural Gas
                        Fuelmaker FMQ-2-36 (since 2001)
                        Previously owned: 2000 GX (11 years), 1995 Bi-fuel Sonoma, 2000 Bifuel Tahoe, 2000 Bi-fuel F150

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