Fleece Return Fuel Pressure Test Port for 2011-2016 LML Duramax

The return fuel pressure test port for the 2011-2016 LML Duramax is designed to aid the technician in troubleshooting return fuel pressure, often necessary when diagnosing CP4 pump failures. When installed in the return fuel system, it allows for a pressure gauge to be connected to the return fuel side to monitor pressure.

Application: 2011-2016 GM 2500-3500 Duramax 6.6L