JLM Diesel Fuel Injection System Cleaner Heavy DutyJLM Diesel Fuel Injection System Cleaner is a fuel additive which is specifically designed for heavy duty vehicles on or off road (such as trucks, semi's, heavy machinery and stationary engines). It effectively removes carbon deposits from injectors and restores the optimal injector spray pattern. Lubricates the fuel pump and injectors and prevents needles from seizing. Improves combustion using effective cleaning agents and a strong cetane improver.