X Series E53 X5 3.0i (M54) OFFRD
16 00
Fuel supply system E53
1. General
General function description for fuel systems.
2. Parts designation
1. Fuel tank (plastic)
15. Expansion tank
2. Electric fuel supply pump
16. Antiflood valve
3. Pressure limiting valve
17. Roll-over valve
4. Non-return flap
18. Pressure regulator
5. Filler pipe
19. Fuel filter
6. Tank expansion line
20. Fuel rail
7. Suction jet pump
21. Tank vent valve
8. Outlet protection valve
22. Engine control unit
9. Tank cap
23. Intake manifold
10. Fuel feed line
24. Purge line
11. Fuel return line
25. Carbon canister
12. Refueling vent line
26. Evaporation line
13. Service vent line
27. Tank leakage diagnostic module
14. Pressure test line (USA only)
28. Dust filter
3. Function description (see also drawing 5.1)
Fuel system
The saddle-shaped fuel tank contains the electric fuel supply pump in its smaller right half.
The suction jet pump in the left fuel tank half pumps the fuel through the tank expansion line to the right side of the fuel
tank.
The suction jet pump is operated via the fuel feed line.
The pressure limiting valve controls the pressure required to operate the suction jet pump. The outlet protection valve
protects the fuel return line. The valve closes in the event of a pressure drop when the fuel return line is damaged or
disconnected.
This prevents fuel from escaping from the fuel tank in extreme vehicle positions (overturning, inclined position).
The non-return flap prevents fuel from splashing back in the filler pipe after shutdown of the petrol/gas pump nozzle.
The antiflood valve on the underside of the expansion tank protects the system against overfilling during refueling. The
antiflood valve is closed by the fuel rising in the refueling vent line, thereby generating an overpressure in the fuel tank,
which in turn prevents further filling.
Fuel supply to engine
Pressure regulator and fuel filter are incorporated in a single unit.
The fuel is routed from the electric fuel supply pump via the fuel feed line and the fuel filter/pressure regulator unit to
the fuel rail.
RA Fuel supply system E53
BMW AG - TIS
06.02.2013 17:36
Issue status (12/2007) Valid only until next DVD is issued
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