![]() If the high spot on the wavy ring is moved one way to the point where pop off pressure is exceeded and fuel flows sooner, the injection event is advanced. Fuel only flows through the injector as long as its pop off pressure is exceeded. This piston moves the wavy ring inside the pump which is what forces the pistons in the rotor inward as it turns and creates high pressure to pop off, or open, the injector that the rotor is pointed to, to get fuel to flow. The timing advance solenoid is pulse width modulated by the ECM to control timing piston travel against a spring in the housing of the VP44. VP44 is a rotary style medium high pressure injection pump that is mostly mechanical with two electronically controlled components in it – the fuel metering solenoid and the timing advance solenoid. Principle of operation of the VP44 Timing Control Solenoid This configuration prevents overheating of certain electronic components and also interference from signals that are generated by very high currents (up to 20A) in the distributor-type injection pump. A Bosch pump control unit (installed on the pump) and an engine control unit. The diesel injection system with Bosch distributor-type injection pump has two control units for electronic diesel control.
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