– Fuel Pump Actuator, which controls fuel flow to the high pressure pump may be faulty. – The Fuel Pump Actuator may have excessive leakage which may also cause fault code Q0449 to be active. !MWARNING Do not open the high pressure fuel system with the engine running. Engine operation causes high fuel pressure.
Cummins Marine Fuel Shutoff Solenoid Wiring 101 . Time for a class in “Fuel Solenoids 101” 1) Grab your old solenoid and get a 12V battery & some 12 AWG test leads — Go to your bench.. .. Cut the Black wire off the plug ( as close to the plug as possible) and install a GOOD 1/4″ Heavy duty ring terminal on the end..