II. Engine Component Description
U L-Series Diesel 7
Pump Injection Sequence
Intake
Fuel enters the high-pressure chamber
from the intake port. However, even
though the plunger begins to rise,
pressure inside the chamber does not
increase because the fuel from the inlet
port flows back into the fuel reservoir
via the spill-port hole
Beginning of Injection
As the plunger rises, it blocks the spill
port hole in the timing sleeve. The
plunger blocks the inlet port preventing
additional fuel from entering the high-
pressure chamber. It is during this
transition that pressure inside the
chamber begins to develop.
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