The Cummins Fuel Drain Tube 3942966 is used primarily on Stage 2 Automotive 5.9 liter ISB/QSB engines. This Genuine Cummins 3942966 OEM replacement fuel drain tube is the fuel return line that connects to the 1998.5-2002 cylinder head and returns the fuel back to the dodge ram fuel tank on the 24v diesel applications. Trust in Genuine Cummins OE replacement parts to supply quality, fit and function.