Cutaway view and specifications

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The high-pressure pump (CP4.2) is equipped with two pistons. The high-pressure pump is mounted on the force-generation side and is powered by the timing chain mounted on the crankshaft. The high-pressure pump is capable of generating pressures of up to 2000 bar.

The fuel quantity control valve determines the pressure that the pump generates and that is thus present within the fuel rail. This prevents the high-pressure pump from generating excessively high levels of pressure during partial-load operation; the rail pressure regulating valve would then have to discharge the excess pressure. The high-pressure pump's drive-power requirement is reduced, simultaneously reducing the engine's fuel consumption.

Fig 1: Identifying High-Pressure Pump Components

Courtesy of BMW OF NORTH AMERICA, INC.

Index	Explanation
1	Fuel quantity control valve
2	Pistons
3	Overflow valve
4	Spring
5	Double cams
6	Drive shaft
7	Bucket tappet

Note the following specifications for the fuel quantity control valve:

Size	Value
Supply voltage	12 Volts
Duty cycle	30 to 95%
Maximum output current	1.4 A
Temperature range	-40 °C to 130 °C