3 Series E46 316i (M43TU) SAL
VS-23/Burkard
Baugruppe/Group: 16
16 01 00 (557)
Weltweit
All countries
Datum/Date:
12/2000
Functional description of fuel supply system
E38, E39, E46, E52, E53
General information
Fuel supply systems for spark-ignition engines
Fuel system
The electric fuel delivery pump in the fuel tank generates pressure in the fuel system. This pressure is set at a
certain level by the pressure regulator.
Ventilation system
The ventilation system is a closed system which is vented via an activated carbon filter. The carbon in the
activated carbon filter is stored in the form of a granulate. The large surface area of the carbon absorbs the fuel
vapours which occur in the fuel tank. The activated carbon filter needs to be regenerated at regular intervals for
it to be able to continue absorbing fuel vapours. Regeneration is performed by flushing out with fresh air through
the intake manifold. This process is controlled by the engine control unit.
Fuel supply systems for diesel engines
Fuel system
The electric fuel delivery pump in the fuel tank supplies fuel to the engine. Two types of high-pressure pump are
used for injection into the cylinders.
1.
The distributor injection pump. This supplies each cylinder with fuel directly through the respective injector.
2.
The high-pressure pump for common rail systems. This generates the necessary pressure in the fuel rail for
all injectors.
On common rail systems, a third pump has been incorporated between the high-pressure pump and the electric
fuel delivery pump, the so-called inline pump (M57) or gear pump (M67). This pump supplements the fuel
delivery pump in the fuel tank when large quantities of fuel are required.
Ventilation system
Diesel fuel is not easily volatised, eliminating the necessity for an activated carbon filter. The fuel tank is
ventilated directly into the atmosphere.
1. Fuel supply system E38/39
1.1 Description of parts
1. Fuel tank (E38 steel, E39 plastic)
16. Float valve (USA only)
2. Electric fuel delivery pump
17. Fuel return line
3. Surge chamber
18. Fuel feed line
4. Suction jet pump
19. Fuel filter
5. Pressure relief valve
20. Pressure regulator
6. Overflow protection valve
21. 3/2-way valve (M52 USA only)
7. Pressure check line (USA only)
22. Fuel rail
7. Refuelling vent line (all countries)
23. Flush line
8. Non-return flap
24. Engine control unit
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
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