Operation
5556−1/A1
Winterthur Gas & Diesel Ltd.
1/ 3
Fuel Pump
1. General
The fuel pumps (1, Fig. 1) are part of the supply unit (2).
The fuel pumps supply fuel through high pressure pipes to the fuel rail (see 8019-1,
Fuel System). The fuel pumps are controlled to supply the necessary load-related fuel
pressure (up to 1000 bar) in the fuel rail.
For more data about he supply unit, see 5552-1
WCH02236
WCH01192
1
2
1
2
Fig. 1: Location of Fuel Pumps
1 Fuel pump 2 Supply unit
2. Function
The compression spring (9, Fig. 2) keeps the bottom spring carrier (2) against the
guide piston (6), which keeps the roller (4) against the cam (5). When the cam (5)
moves the roller (4) up, the guide piston (6) moves up and the bottom spring carrier
(2) compresses the compression spring (9). The pump plunger (18) then moves up.
The control grooves in the pump plunger (18) control the fuel quantity.
When the toothed rack (12) moves, the teeth engage with the teeth on the regulating
sleeve (17) and the regulating sleeve turns. The regulating sleeve (17) turns the
driver (10) and thus the pump plunger (18).
2014
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