51
OXE 150/200 HP SERVICE MANUAL
FUEL SYSTEM DESCRIPTION
Fuel rail assembly
The fuel rail assembly attaches to the cylinder head. The fuel rail distributes pressurised fuel to the fuel
injectors through the fuel lines.
The fuel rail pressure sensor gives the engine control mode (ECU) an indication of fuel pressure. The ECU uses
this information to regulate fuel pressure, by commanding the fuel pressure regulator open or closed on the
inlet of the fuel injection pump.
Fuel injectors
A fuel injector is a solenoid device, controlled by the ECU, that injects pressurised fuel to a single engine
cylinder. Fuel from the injector tip is sprayed directly into the combustion chamber on the compression stroke
of the engine.
The control functions for the fuel injection system are integrated in the engine control module ECU.
Quick-connect fitting
Quick-connect fittings provide a simplified means of installing and connecting fuel system components.
The fittings consist of a unique female connector and a compatible male pipe end. O-rings, located inside the
female connector, provide the seal. Integral locking tabs inside the female connector hold the fittings together.
Fuel pipe O-rings
O-rings seal the connections in the fuel system. Fuel system O-ring seals are made of a special material.
Service the O-rings seals with the correct service part.
EVACUATING AIR FROM FUEL SYSTEM
NOTE!
In order for the diesel fuel system to work properly, the fuel lines must be full of fuel and contain no
air. If air gets into the fuel lines, it will be necessary to evacuate the air from the system to eliminate the air
before operating the outboard. Air could have entered the system in any of the following ways:
-
The engine ran out of fuel.
–
The fuel lines have damaged/leaking joints.
-
The filter was removed for service or replacement.
-
The fuel lines were removed or disconnected for servicing.
-
The fuel pump was removed for servicing.
-
The fuel pre-filter water drain cock was opened while the engine was running.
If one or more of the above occurred, air has entered the fuel system and you will need to evacuate the air from
the system prior to operating the outboard.
Bleeding fuel system
1.
Turn the ignition key
ON
. The fuel pump will run for 20 seconds.
NOTE!
Do not turn the ignition key to
START
. This could damage the injection pump.
2.
Repeat three times.
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