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3.5.3 Fuel system
Description
In case of internal fuel supply, fuel from the fuel tank
(FT) is circulated by the engine fuel pump (FP
E
). The
fuel is pumped through a 3-way valve (TWV) to the
primary coarse fuel filter (FF
PC
).
The fuel then passes through the engine fuel filter
(FF
E
) and enters the engine (E).
The fuel, which is not used by the engine for
combustion, returns via the 3-way valve to the fuel
tank.
Instead of internal fuel supply via the fuel tank,
external fuel supply is possible.
When using external fuel, both the supply and the
return hose must be connected to the external fuel
supply couplings (EFC).
No restrictions are allowed in those hoses.
Take the necessary precautions to keep the fuel return
hose opened and connected, while the unit is running.
Check that the primary fuel filter is not shut off.
Restart the unit.
The unit must be stopped before
switching from the internal to an
external fuel source.
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