MTU 20 V 4000 G23 Operating Instructions Manual page 131

2. Open threaded vent plug (5) of filter to be
flushed.
3. Unlock drain valve (6) by pressing valve
toggle, open it 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 (5) and drain
valve (6).
Fuel prefilter – Topping up with fuel
1. Stop engine (→ Page 46) and disable engine start.
2. Remove screws for cover and take off cover (2).
3. Fill filter housing with clean fuel.
4. Place new gasket in cover (2).
5. Fit cover with gasket and secure it with screws.
6. Check differential pressure (→ Page 128).
Result: If flushing did not lead to an improvement of the differential pressure, replace filter element of fuel prefil‐
ter (→ Page 132).
MS150093/01E 2012-06 | Task Description | 131