5.5.4 Fuel pump
The fuel pumps (001, Figure 5-35) supply the fuel rail with fuel at high pressure. The number of
fuel pumps is related to the engine.
Fig 5-35 Fuel pump (generic)
Legend
001 Fuel pump 002 Supply unit
5.5.4.1 Function
When the cam (007, Figure 5-36) moves the roller (006) up, the guide piston (008) moves up.
Then the bottom spring carrier (005) compresses the compression spring (004). The pump
plunger (003) then moves up. The control grooves in the pump plunger (003) control the fuel
quantity.
When the toothed rack (011) moves, the teeth engage with the teeth on the regulating sleeve
(010) and the regulating sleeve turns. The regulating sleeve (010) turns the driver (009) and
thus the pump plunger (003). The quantity of fuel that goes into the plunger chamber is related
to the control position (between 0 for zero supply and 10 for maximum supply).
X92DF
AA00-5556-00AAA-043A-A
Operation Manual Fuel pump
Winterthur Gas & Diesel Ltd.
- 212 - Issue 002 2020-08
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