INSPECTION AND ANALYSIS HIGH-PRESSURE FUEL PUMP Fig. 21 High-pressure Fuel Pump Leak at Weep hole. CONDITION: High-pressure pump leak at weep hole. A damp area at the pump weep hole is acceptable for service. Continuous dripping at the weep hole would define a leak and require servicing. CAUTION: Presence of excessive amount of diesel fuel could present a safety hazard and should be addressed immediately. CAUSE: Pump drive shaft pump body seal leaking. Fuel system contaminates can contribute to this cause. Excessive fuel temperature or dry operation of the pump may also result in seal damage. RECOMMENDATION: Replace High-pressure pump assembly.
Evaluate fuel condition and condition of equipment fuel system for contributing factors. Review events of dry operation and priming procedures being used. REUSE: Do Not Reuse! NOTICE: Do not disassemble the high-pressure fuel pump for any reason! All high-pressure fuel pumps are to be returned intact as Reliabilt® cores. Page 22