Bosch Inline Injection Pumps

When the individual pumps are contained in a single housing with their high-pressure fuel outlets arranged in a straight line, the assembly is referred to as a PLN (pump-line-nozzle) system. Bosch and other pump OEMs call these pumps PE models (the P for “pump” and the E for “enclosed camshaft”), since they are mounted lengthwise within the base of the pump housing and driven from the engine gear train. As shown in Figure 19-5, these pumps can be mounted in one of three ways: base, cradle, or flange. The type of mounting is determined by looking at the drive end of the pump. When an inline pump is flange mounted, a third letter, S, is added to the designation, with the pump designated as a PES unit.