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A36 | Gasoline injection components
Bosch Automotive Aftermarket 2008 | 2009
High-pressure pump HDP-1
Purpose:
The 3-barrel radial-piston high-pressure pump is driven by the camshaft via a coupling.
It compresses the fuel provided by the electric fuel pump up to 12 MPa and delivers it to the
high-pressure fuel rail (KVS-HD). The fuel cools and lubricates the high-pressure pump.
Part number:
0 261 520 ...
High-pressure pump HDP-2
System:
Motronic gasoline direct injection
Purpose:
In contrast to the HDP-1, the high-pressure pump HDP-2 is a unit pump. It is a demand-
regulated, intermittent-delivery 1-barrel piston pump with a maximum pressure range up to
120 bar. It features an integral pressure damper and the integrated fuel-quantity control valve.
The pump is of modular design for flexible adaptation to different customer requirements. The
HDP-2 is driven via the bucket tappet which is actuated by the camshaft. It is attached directly
to the cylinder head or to an adapter housing.
Part number:
0 261 520 ...
High-pressure pump HDP-5
System:
Motronic gasoline direct injection
Purpose:
The HDP-5 is a quantity-controlled single-barrel high-pressure pump for 4 to 8-cylinder engines.
In new engine projects it supersedes all the previous 1st-generation Bosch high-pressure
pumps (HDP-1 and HDP-2).
Part number:
0 261 520 ...
High-pressure sensor
Purpose:
The sensor installed in the high-pressure fuel rail is designed to detect the fuel-pressure level
in the rail. The pressure measured is used as actual quantity for rail-pressure regulation.
Part number:
0 261 545 ...