3 Series E90 335d (M57T2) SAL
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.
Fuel supply to engine:
Fuel is pumped by the electric fuel pump to the injector via the fuel feed line, the fuel filter with electric heater and the
high-pressure pump.
The fuel tank is vented during refueling via the filler vent valve.
Venting during vehicle operation is performed via the service vent valve.
The filler vent valve in the tank is closed by the rising fuel if the tank is overfilled. The residual volume thus created
replaces the expansion tank. The ventilation function is maintained by a second float valve.
Both valves are designed as rollover valves. This prevents fuel from escaping from the fuel tank in extreme vehicle
positions (overturning, inclined position).
Determining fill level in fuel tank:
The fuel level is measured by means of lever-type sensors on both sides of the fuel tank. The combination of the
determined ohm values from the right and left lever-type sensors produces the actual level in the fuel tank.
Operation of electric filter heater:
The electric filter heater cuts in under the following conditions as a function of fuel pressure and fuel temperature:
-
Cold, viscous fuel exceeds a specific fuel pressure (in the filter inlet).
-
Fuel drops below a specific temperature (under 2
°
C).
4. Service data, fuel system
Operating pressure in rail up to 1600 bar.
Operating pressure ahead of high-pressure pump approx. 5.6 bar.
RA Diesel fuel supply system
BMW AG - TIS
21.02.2013 08:52
Issue status (12/2007) Valid only until next DVD is issued
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