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2.
Connect filling pump to filling connection (1)
on the intake side of the filter.
3.
Open threaded vent plugs (2) and fill with fuel
until fuel emerges from the vent pipe (3).
4.
Close threaded vent plugs (2).
5.
Open fuel shutoff valve.
6.
Check differential pressure (→ Page 174).
Result:
If flushing did not improve differential pres-
sure, replace fuel prefilter element
(→ Page 183).
Flushing fuel prefilter with
switchable duplex filter
1.
Cut out contaminated filter (A or B):
1 Filter A switched off
2 Filter B switched off
2.
Open threaded vent plug (1) of the filter to be
flushed.
3.
Remove drain valve (2) and drain coolant.
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 (1) and drain
valve (2).
MS150031/06E 2016-010 | Fuel Filter | 181
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