WinGD X35-B - Fuel Pump

5.5.3 Fuel pump
The two fuel pumps supply the fuel rail with fuel at high pressure.
Fig 5-29 Fuel pump (generic)
001
003
004
002
005
006
007
Legend
001 Fuel return 005 Pinion
002 Fuel inlet 006 Fuel leakage outlet
003 Flow control valve (CV 7231-32C) 007 High pressure fuel outlet
004 Lubricating oil inlet
5.5.3.1 Function
The gear wheel of the supply unit drives the pinion (005, Figure 5-29) and thus the camshaft of
the fuel pump. The four plungers in the fuel pump compress the fuel. The flow control valve
(003) controls the flow related to the signal of the engine control system. This controls the
pressure to the fuel rail.
5.5.3.2 Lubrication
The oil filter in the lubricating oil inlet pipe prevents contamination of the fuel pump with large
particles. The oil then flows through the lubricating oil inlet (004) into the bottom housing and
thus lubricates the fuel pump. The lubricating oil then flows back to the housing of the supply
unit.
X35-B
AA00-5556-00AAB-043A-A
Operation Manual Fuel pump
Winterthur Gas & Diesel Ltd.
- 186 - Issue 001 2019-10