Filling fuel prefilter with switchable duplex filter
1.
Stop engine (→ Page 116) and disable engine start.
2.
Connect filling pump to filling connection (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 approx.
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 po-
sition.
8.
Check differential pressure (→ Page 174).
Result:
If flushing did not improve differential pres-
sure, replace fuel prefilter element
(→ Page 183).
182 | Fuel Filter | MS150031/06E 2016-010
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