MotorVac IDT 4000 DieselTune 4000 Diesel Fuel SystemHow the IDT 4000 DieselTune Works The DieselTune is a 2 line cleaning system that connects to the engine through quality OEM specific adapters. The IDT 4000 passes a concentrated mixture of MotorVac cleaning detergent and diesel fuel through the components of the fuel system while the engine is running. The system removes organic and inorganic fuel deposits that build up in fuel injector, injection pumps and combustion chambers. Carbon, gum and