MTU 12V4000M73 series Operating Instructions Manual page 204

13. Open rotary slide valve (2) a little (turning to
approx. 30°) to introduce fuel into the filter
housing with the new filter element.
14. Close vent valve (1) as soon as fuel emerges
from vent pipe (4).
15. Turn the rotary slide valve to the upright posi-
tion (3) until it engages.
Result: Both filters are cut in.
16. Set differential pressure gage (→ Page 195).
202 | Fuel Filter | MS150045/03E 2018-08