Fleece Return Fuel Pressure Test Port
For 2011, 2012, 2013, 2014, 2015, 2016 GM 6.6L Duramax LML
The return fuel pressure test port for the 2011-2016 LML Duramax is designed to aid the technician in troubleshooting return fuel pressure, frequently 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 return fuel side to monitor pressure.