Fuel Pump Back Leakage Valve (005-059)
B3.9 and B5.9 Series Engines
Section 5 - Fuel System - Group 05
Inspect for Reuse (005-059-007)
Inspect the valve to be sure it is not stuck.
Inspect the sealing surfaces for possible leak paths.
The installation torque is very critical. Overtightening
can distort the bore in the pump hydraulic head, caus-
ing the rotor to seize in the bore. Never tighten the valve
with the engine running.
Assemble the back leakage valve and new washers.
Tighten the valve.
Connect the high-pressure line. Refer to Procedure 006-051.