Priming the Fuel System
!
WARNING
Fuel is flammable and explosive. Ensure that the key switch is off and the lanyard is positioned so that the engine cannot
start. Do not smoke or allow sources of spark or open flame in the area while servicing. Keep the work area well ventilated
and avoid prolonged exposure to vapors. Always check for leaks before attempting to start the engine, and wipe up any
spilled fuel immediately.
Using Fuel from the Boat Tank
The fuel system is connected to the fuel tank on the boat and fuel is in the tank. This method does not require the use of a
portable fuel tank.
Using Fuel from a Portable Tank
A portable fuel tank is connected to the engine and no fuel is in the boat fuel tank. After test running the engine connect the fuel
line from the boat fuel tank to the fuel system. Follow the precautions in the appropriate Mercury MerCruiser Installation
Manual for disconnecting the portable fuel tank and reconnecting the fuel line from the boat fuel tank to the boat fuel system.
The following procedure is the alternative method for priming the fuel system on all MPI models.
1. Remove the cap from the fuel pressure test port.
a - Fuel pressure test port
b - Fuel rail
2. Open the vent on the pressure relief collection tank and connect the pressure relief tool to the fuel pressure test port.
3. Place the collection tank in a convenient location to ensure the clear hose is viewable from the helm.
4. Turn the ignition key to the on position. Do not turn the ignition key to the start position.
5. When the fuel pump stops running, turn the key off.
6. Again, turn the key back to the on position. Do not turn the ignition key to the start position.
MPI ECT Fuel System
Page 5A-6 © 2016 Mercury Marine 90-8M0099748 eng DECEMBER 2015
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