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Transfer of CNG or propane requires a compressor.
When my in-laws owned a campground they had a propane refill station. F-I-L installed a propane conversion kit on his new 1978 Chevy C20 that could be swapped from gas to propane with a switch and a couple of valves. Once gas got cheap again he stopped using the propane. I don't know what happened to the truck.
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