Fleece Performance Return Fuel Pressure Test Port 11-16 GM 6.6L Duramax LML

Whether you are a certified technician or an expert backyard mechanic, having the right tool for the job is imperative. This Return Fuel Pressure Test Port from Fleece will allow you to troubleshoot return fuel pressure that is necessary when diagnosing LML 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.