MTU Detroit Diesel 183 Series Technical Publication page 298

Group 07
Subgroup 5700 Task Description
Page 2
B Pressure of delivery pump(s) and opening pressure of overflow valve measurement
Connect testing equipment (1), part No. 617 589 04 21 00 between delivery pump and fuel filter.
Start engine. Pressure gauge displays opening pressure of overflow valve (2), min. 1.3 bar.
When hose (arrow) is compressed, pressure gauge displays pressure of delivery pump, >2.0 bar.
For 12V 183 engines, repeat procedure on second delivery pump.
20080/0 E 97-02