PERC helps debut propane direct-injection fuel system at ACT Expo 2025

A new propane direct-injection fuel system — developed through a collaboration between Stanadyne, Katech and the Propane Education & Research Council — made its public debut this week at ACT Expo 2025.

The technology was showcased in a GM 2023 Chevrolet Silverado 2500 HD at the PERC booth.

This system combines Stanadyne’s direct-injection fuel pump with vapor lock technology and injector system with Katech’s vapor lock inhibitor to create a medium-duty engine capable of delivering propane autogas up to 200-bar pressure directly into the combustion chamber. Integrated into the Chevrolet Silverado’s 6.6L V8 L8T engine, the system produces 401 horsepower, 464 lb-ft of torque and enables a towing capacity of up to 17,370 lbs.

“The test engine/vehicle required only minimal modifications,” says Srinu Gunturu, chief engineer at Stanadyne. “With our newly developed LPG direct-injection pump and injectors, the system demonstrates strong potential for cost-effective scalability and broad commercialization. This technology not only reduces emissions but also makes clean propulsion more accessible for medium- and heavy-duty vehicles where electrification remains a challenge.”

During a 250-hour performance and durability test, the integrated system demonstrated compatibility with existing engines. Compared to diesel, PERC reports that propane autogas reduces harmful nitrogen oxide (NOx) emissions by up to 96% and lowers carbon dioxide (CO₂) emissions by 5% to 10%. 

“This solution delivers lower emissions, higher efficiency, and the potential for significant cost savings because propane provides the lowest total cost of ownership,” says Gavin Hale, director of product development and power generation at PERC. “This is the innovation fleet owners need to meet sustainability and economic goals.”