3 Series E46 316i (M43TU) SAL
3.
There is no leakage diagnosis pump/tank leakage diagnostic module or dust filter.
4.
For Japanese vehicles, the refueling vent line (USA) is replaced by an additional vent line with a float valve in the
expansion tank, which is connected to the refueling vent line (worldwide).
This modification is required on account of the more heavily gas-emitting fuel in Japan (see drawing 5.2).
Leakage detection for tank venting system USA (see drawing 5.3 / 5.4)
The leakage diagnosis pump or tank leakage diagnostic module serves to detect leakages for the tank venting system
within the on-board diagnosis laid down by legislation.
The tank venting system is pressurized and the pressure loss is detected in the event of a leak.
With the leakage diagnosis pump, the pressure loss is measured by way of the repumping time. The pump is operated
with vacuum pressure from the intake manifold via the vacuum line.
The tank leakage diagnostic module detects the pressure loss by way of the power consumption of the integrated
pump. The air required for this purpose is supplied via the dust filter.
Both systems are activated by the engine control unit.
The pressure test line establishes the connection between fuel tank and filler neck. This enables a leak to be detected
in the filler pipe - tank cap area.
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 right lever-type sensor is
integrated in the fuel supply unit. The left lever-type sensor is located in the left sensor unit. The combination of the
determined ohm values from the right and left lever-type sensors produces the actual level in the fuel tank.
4. Service data, fuel system
Pressure regulator: 3.5 bar.
Working pressure of suction jet pumps: 1 - 1.3 bar
5. Schematic drawings of fuel supply systems
RA Fuel supply system E46 (spark ignition engines)
BMW AG - TIS
19.01.2013 11:12
Issue status (12/2007) Valid only until next DVD is issued
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