Due to the added liability risk from improperly installed CNG systems, you will very rarely see a CNG kit offered for the DIYer. The hardware is simple and the installation is straightforward for mono-fuel carburetor conversions because a CNG carburetor is the same as an LPG carburetor. CNG/LPG carburetors are available in a standard SAE carb flanges for 1bbl, 2bbl, and 4bbl configurations (see the Master Catalog on the Impco Products Page and the Streamline Catalog on the NGVINA Streamline Page). However, dual fuel conversion can be a bit harder because of the difficulty in obtaining increasingly obsolete adapters.

In California, CARB regulations apply to 1976 and newer vehicles. Your local CNG conversion shop could use any system to convert a 1951 F1 but would require a CARB-certified kit for a 2005 F-250. For states not requiring CARB, commerically-installed conversions must use EPA-certified kits.