Detroit Diesel — Fig. 21 High-pressure Fuel Pump Leak at Weep hole.

LOW-PRESSURE FUEL DELIVERY PUMP Fig. 24 LOW-PRESSURE FUEL DELIVERY PUMP LOW-PRESSURE FUEL PUMP OUTLET PIPE FUEL JUNCTION BLOCK The low-pressure fuel delivery pump receives fuel from the fuel junction block through the low-pressure pump inlet pipe. The fuel is then pressurized by the low-pressure fuel delivery pump to a normal operating pressure range of 64 PSI to 85 PSI at rated speed. The pressurized fuel is then sent to the fuel junction block via the low-pressure fuel pump outlet pipe.

The fuel junction block directs the low-pressure fuel through the primary and secondary fuel filter to the supply line providing low-pressure fuel to the high-pressure fuel pump regulator valve assembly inlet port. Page 25 LOW-PRE FUEL PU INLET PI LOW-PRE FUEL PU INLET PI SSURE MP PE