Fuel prefilter with single-stage
filter – Flushing
1. Close fuel shutoff valve.
2. Loosen threaded vent plugs (1).
3. Open drain valve (2) and drain fuel.
Result: Fuel flows from filtered side back to unfil-
tered side, flushing filter deposits downwards
out of the filter.
4. Close threaded vent plugs (1) and drain
valve (2).
Fuel prefilter with single-stage filter – Filling
1. Stop engine (→ Page 57) and disable engine start.
2. Connect filling pump to filling connection (1)
on intake side of filter.
3. Loosen threaded vent plug (2) and fill with
fuel until fuel emerges from vent pipe (3).
4. Close threaded vent plugs (2).
5. Open fuel shutoff valve.
6. Check differential pressure (→ Page 118).
Result: If flushing did not improve differential pres-
sure, replace fuel prefilter element
(→ Page 126).
M015650/06E 2018-05 | Fuel Filter | 123
TIM-ID: 0000064788 - 003
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