What is the VP pump?
First sold in 1996, the VP pump was the first electronically controlled pump with a high pressure solenoid valve to measure the amount of fuel injected to each cylinder with extreme accuracy and at a very high injection pressure (over 1,800 bars). New VP pumps are fitted with a monoblock injection system containing the pump and the electronics.
At the current level of development, the VP 44 axial piston distributor pump achieves an injection pressure of over 1,800 bars at the injector. Its hydraulic efficiency has been optimised to give a driving torque that is the same as that of a traditional distributor pump, despite a considerable increase in pressure. The fuel is metered via a solenoid valve. A minute but precisely metered amount of fuel is pre-injected to reduce combustion noise. New generation VP 44 pumps have a computer mounted directly on the pump casing that controls the injection and engine functions, removing the need for a separate computer for the engine and making for a very compact, complete system. (Source: BOSCH)
