2.
Open threaded vent plug (5) of the filter to
be flushed.
3.
Unlock drain valve (6) by pressing toggle,
open it and drain fuel.
Result:
Fuel flows from filtered side back to the un‐
filtered side, flushing the filter deposits
downwards out of the filter.
4.
Close threaded vent plug (5) and drain
valve (6).
Filling fuel prefilter with fuel
1.
Stop engine (→ Page 91) and disable engine start.
2.
Remove screws securing the cover and take off cover (2).
3.
Fill filter housing with clean fuel.
4.
Place new gasket in cover (2).
5.
Fit cover with gasket and secure it with screws.
6.
Check differential pressure (→ Page 135).
Result:
If flushing did not lead to an improvement of the differential pressure, replace filter element of fuel prefil‐
ter (→ Page 139).
138 | Task Description | MS150031/03E 2011-10
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