2.
Open threaded vent plug (1) of filter to be
flushed.
3.
Open drain valve (2) 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 (1) and drain
valve (2).
Filling fuel prefilter with fuel
1.
Stop engine (→ Page 63) and disable engine start.
2.
Connect filling pump to filling connec-
tion (1) on the intake side of the filter.
3.
Open vent valve (2) and fill with fuel until
fuel emerges from the vent pipe (3).
4.
Close vent valve (2).
5.
Open rotary slide valve (4) a little (by ap-
prox. 30°) and open vent valve(s) (2), until
fuel emerges from the vent pipe (3).
6.
Close vent valve(s) (2).
7.
Turn rotary slide valve (4) back to locked
position.
8.
Check differential pressure (→ Page 98).
Result:
If flushing did not improve differential pres-
sure, replace filter element in fuel prefilter
(→ Page 103).
102 | Task Description | M015650/05E 2014-03
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