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Adding 2nd tank to 2005 Silverado 2500HD

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  • Adding 2nd tank to 2005 Silverado 2500HD

    I just purchased a 2005 Silverado 2500HD Dedicated CNG truck. It has a 21.3GGE tank which gives about a 265 mile safe range. Because the truck is a dedicated CNG vehicle, there is a large space under the bed where the gasoline tank would have been installed. I want to intall a 2nd tank in this spot, but am unsure about the plumbing. There is a valve on the existing tank with three ports. One port has a plug in it, that I think would be where I would plumb in the 2nd tank. Is it as simple as installing the new tank with brackets, and running a high pressure line from the new tank's valve to the port with the plug? I have attached a picture of the valve with the plugged port. Also, can I use 10,000 psi rubber coated hydraulic line, or do I need to use hard stainless line?
    Picture of the plug with yellow index paint

  • #2
    Doubt u could fit 1 tank, most underbody systems use 3 tanks as the space under the truck is short and rectangular, making the space ideal for a twin tank setup

    Google pictures of the crown vic cng tank setup for reference

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