3 Series E46 316i (M43TU) SAL
the gear pump.
The high-pressure pump supplies fuel to the injectors via the distributor block and the fuel rails.
The gear pump, which is flange-mounted directly on the high-pressure pump, generates the necessary fuel delivery
pressure for the high-pressure pump.
The fuel return from the injectors and from the high-pressure pump is fed into the bimetal valve (for functional
description of bimetal valve and H-piece, see M47).
The check valve in the H-piece isolates the fuel feed from the fuel return. This prevents a loss of pressure when large
quantities of fuel are required.
Ventilation system
When refuelling, the fuel tank is vented through the refuelling vent line in the fuel filler neck.
While driving, the fuel tank is ventilated through the operating vent lines, the expansion tank and the dust filter.
The condensed components of the fuel vapours are fed back from the expansion tank into the fuel tank through the
left-hand operating vent line.
Fuel level measurement in the fuel tank
For description, please refer to "Fuel supply system E38/39,
1.2 Functional description, fuel level measurement in the fuel tank".
5.3 Fuel system operating data
Operating pressure of fuel delivery pump: 0.4 bar
Operating pressure of suction jet pumps: 1 - 1.3 bar
SBT Functional description of fuel supply system E38 E39 E46 E52 E53
BMW AG - TIS
19.01.2013 20:41
Issue status (12/2007) Valid only until next DVD is issued
Copyright
Page - 21 -
