5.5.3
Fuel pump
The fuel pumps (001,
) supply the fuel rail with fuel at high pressure. The number of
fuel pumps is related to the engine.
Fig 5-25
Fuel pump (generic)
001
002
Legend
001
Fuel pump
002
Supply unit
5.5.3.1
Function
When the cam 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).
5.5.3.2
Lubrication
Engine lubricating oil, which flows through the lubricating oil inlet into the bottom housing,
lubricates the fuel pump.
X72-B
AA00-5556-00AAA-043A-A
Operation Manual
Fuel pump
Winterthur Gas & Diesel Ltd.
- 188 -
Issue 003 2021-12
