CleanFuel USA announced that is has received Environmental Protection Agency and California Air Resources Board (CARB) approval for its liquid propane fuel injection system for the Freightliner Custom Chassis Corp. S2G chassis.

The engine and fuel system may now be purchased and used in all 50 states and Canada for up to 33,000 lbs. GVWR, CleanFuel said.

The chassis, which includes an 8L engine built by Powertrain Integration from a General Motors long block and a liquid propane injection (LPI) system manufactured by CleanFuel, will be in full production by early September. Initial chassis platforms include a propane bobtail delivery vehicle and a propane autogas school bus, the Thomas Built Saf-T-Liner C2.

The S2G has a carbon monoxide rating of 60% below and a nitrogen oxide rating of 20% below EPA set standards for heavy duty vehicles, CleanFuel said.

“We are thrilled with our emissions results and excited to move forward to production,” said Wayne Moore, COO of CleanFuel USA. “As the only propane autogas vehicle available on the market with a GVWR of 33,000 lbs., the S2G greatly expands fleet offerings using this clean and abundant alternative fuel.”

The S2G chassis has been put through a variety of engine and durability tests, the company said.

“Our vehicles are held to an immensely high engineering standard, and the S2G is certainly no exception,” said Bryan Henke, FCCC’s manager of product marketing. “The countless hours that the engineering teams put into testing and validating each and every component of the chassis, engine and fuel system is paying off as we are now able to offer a superb propane autogas product to the medium-duty market.”

The factory-installed fuel system is supported through FCCC’s nationwide service network.