Abstract: A filter and a method of using the filter for removing contaminants from liquid propane gas. The liquid propane gas enters the filter through an inlet and passes through a first filtration element where chemical contaminants are removed by a molecular sieving agent. The molecular sieving agent may be a zeolite. Subsequently, the liquid propane gas passes through a second filtration element where particulate contaminants are removed. The invention is also a method of removing contaminants from liquid propane gas including the step of routing the flow of the liquid propane gas through chemical and particulate filter elements so that chemical and particulate contaminants are sequentially removed.

Abstract: An alternative fuel system and compressed natural gas (CNG) conversion kit, primarily for smaller size industrial vehicles, such as compact loaders and lift trucks restricted in the space available in the engine compartment for the components of a CNG system where the vehicle was initially engineered for other fuel systems such as gasoline liquid petroleum gas (LPG) or diesel fuel having substantially fewer parts and components and less complex systems. A CNG tank is mounted horizontally outside of the engine compartment and a high pressure line connects from the tank to a regulator mounted inside the engine compartment for decompressing the gas to a pressure suitable for mixing with air in the carburetor of the engine. The CNG system has a refilling receptacle with an electrical interlock to the ignition preventing accidental drive-away.