5 Series E61 523i (N52) TOUR
16 00
Fuel supply system E60/E63/E64
1. General
General function description of fuel system.
2. Component designation
1. Fuel filler neck
13. Service opening, right
2. Outlet protection valve
14. Filler vent connection (see drawing 5.1)
14. Filler vent valve (see drawing 5.2)
3. Electric fuel pump
15. Service vent valve
4. Fuel filter
16. Service vent valve
5. Feed line
17. Carbon canister
6. Fuel injectors
18. Tank vent valve
7. Pressure regulator
19. Purge air from carbon canister to intake manifold
8. Suction jet pump, left
20. Air filter (insect strainer)
9. Suction jet pump, right
21. Digital Motor Electronics
10. Fuel level sensor, right
22. Lambda oxygen sensor
11. Fuel level sensor, left
23. Exhaust manifold
12. Service opening, left
3. Function description (see also drawing)
Fuel system
The saddle-shaped fuel tank contains the surge chamber with electric fuel pump on its right side.
The surge chamber ensures that the fuel pump is properly supplied in all vehicle operating states.
The suction jet pumps direct the fuel from the left and right halves of the tank into the surge chamber.
Suction jet pumps utilize the venturi effect to draw in further fuel via a jet and pump on both quantities of fuel.
Return line, pressure regulator and fuel filter are located in the tank.
Fuel supply to engine:
The electric fuel pump draws in fuel from the surge chamber and pumps it to the fuel filter/pressure regulator via the
delivery line to the fuel rail.
Pressure regulator and fuel filter are incorporated in a single unit in the tank. This removes the need for a fuel return
line.
The pressure regulator limits the pressure in the fuel feed line to 3.5 bar. If the pressure rises above 3.5 bar, the
regulator opens a discharge hole. The excess fuel flows back through the discharge hole into the right tank half (surge
chamber) and drives the two suction jet pumps.
The fuel rail thus operates on a return-free basis.
Tank venting system (US version):
During refueling, the fuel tank is vented via the filler vent valve and the filler vent line. The petrol/gasoline gases are
directed during refueling via the filler vent valve and the vent line through the carbon canister and thus discharged in
RA Fuel supply system E60/E63/E64
BMW AG - TIS
05.02.2013 02:33
Issue status (12/2007) Valid only until next DVD is issued
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