MTU 12 V 4000 G73 Operating Instructions Manual page 111

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 34) 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 108).
Result: If flushing did not lead to an improvement of the differential pressure, replace filter element of fuel pre-
filter (→ Page 112).
MS150029/02E 2013-03 | Task Description | 111