User Manual

SENR9977 15
Systems Operation Section
When the engine is operated, the fuel is pulled from
the fuel tank (6
) through the primary fuel filter/water
separator (3) by the fuel transfer pump (2). When the
fuel passes through the water separator, any water
in the fuel wil
l go to the bottom of the bowl. The fuel
transfer pump is equipped with a secondary fuel filter.
From the fuel priming pump, the fuel passes through
the fuel supp
ly line to the fuel injection pump (7).
The fuel injection pump sends fuel through the high
pressure fuel lines to the fuel injectors (1). The fuel
injectors s
pray atomized fuel into the cylinders.
The fuel injection pump needs fuel for lubrication. The
precision p
arts of the pump are easily damaged. The
engine must not be operated until the fuel injection
pump is full of fuel. The system must be primed when
any part of t
he system is drained of fuel. The fuel
system needs priming when a fuel filter is changed,
and/or when a fuel line is removed, and/or when the
fuel injec
tion pump is replaced.