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 unfil-
tered side, flushing the filter deposits down-
wards out of the filter.
4.
Close threaded vent plug (5) and drain
valve (6).
Fuel prefilter – Filling with fuel
1.
Remove screws for cover and take off cover (2).
2.
Fill filter housing with clean fuel.
3.
Place new gasket in cover (2).
4.
Fit cover with gasket and secure it with screws.
5.
Check differential pressure (→ Page 174).
Result:
If flushing did not improve differential pressure, fit new filter element (→ Page 183).
Flushing fuel prefilter with sin-
gle-stage filter
1.
Close fuel shutoff valve.
2.
Open threaded vent plugs (1).
3.
Open drain valve (2) and drain fuel.
Result:
Fuel flows from filtered side back to the unfil-
tered side, flushing the filter deposits down-
wards out of the filter.
4.
Close threaded vent plugs (1) and drain
valve (2).
Filling fuel prefilter with single-stage filter
1.
Stop engine (→ Page 116) and disable engine start.
180 | Fuel Filter | MS150031/06E 2016-010
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