Evaluation of Automatic Stop Fill Valves for Propane Vehicles

Propane powered vehicles require a method of ensuring that the tank is not filled beyond the 80% volume level. Devices available to control the fuel level were analyzed in regards to basic design and effect of operating environment. Vehicle and lab testing supported the valve analysis. The lack of a reliable and fail safe system resulted in the recommendation to pursue a shutoff system that incorporates a liquid fuel level sensor in the tank and a shutoff mechanism on the fuel dispenser.