INSPECTION AND ANALYSIS HIGH-PRESSURE FUEL PUMP Fig. 19 Normal Gear Position Fig. 20 Disengaged Gear Position CONDITION: High-pressure pump seized, drive gear disengaged. CAUSE: High-pressure fuel pump bearing failure. L ow-pressure fuel flow restriction, which starved the high-pressure pump causing a lack of lubrication or cooling condition. RECOMMENDATION: Replace High-pressure pump assembly and follow fuel system cleaning procedure in Maintenance Section. Evaluate fuel system for source of low-pressure fuel flow restriction. REUSE: Do Not Reuse! NOTICE: Do not disassemble the high-pressure fuel pump for any reason! If the pump fails to rotate, replace the pump assembly.
All high- pressure fuel pumps are to be returned intact as Reliabilt® cores. Page 21