Leakage fuel lubricates the pump plunger (003). The leakage fuel and the engine lubricating oil
from the regulating sleeve (010), flows through the drain bore, into an internal bore in the housing
of the fuel pump unit.
5.5.3.3 Operation with an unserviceable fuel pump
If a fuel pump is unserviceable (eg the pump plunger cannot move) or the HP fuel pipe is broken
(between the fuel pump and the fuel rail) the fault must be repaired immediately.
If the fault cannot be repaired, it is possible to cut out the unserviceable fuel pump. Related to the
number of installed fuel pumps, there are limits of operation.
X72-B
AA00-5556-00AAA-043A-A
Operation Manual Fuel pump
Winterthur Gas & Diesel Ltd.
- 189 - Issue 003 2021-12
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