3 Series E30 325i (M20) SAL
•
Connection between fuel filler pipe and fuel tank
•
Connections of filler vent line or of fuel tank vent lines I and II (16, 17, 18, Fig. 2)
Unlikely but possible leak points:
•
DMTL solenoid valve
•
Fuel evaporation control valve
•
Connection between DMTL and activated carbon filter (19, Fig. 2)
•
Pressure relief valve in the fuel filler cap
•
Mating between fuel cap and fuel filler neck
Note:
If a repair was previously carried out on the fuel supply system, the leak will
probably be at the repair location.
Important:
1.
The pressure relief valve in the fuel filler cap can only be checked as
described in Repair Instructions RA 16 11 130.
2.
If the mating between the fuel cap and the fuel filler neck is leaking, the fuel
cap and the fuel filler pipe (both!) must be replaced.
Case 4. Leak detector
The following devices can be used for leak detection purposes:
•
Devices that respond to ultrasound
•
Devices that respond to hydrocarbon hydrates
Part number of the device recommended by BMW (responds to hydrocarbon hydrates):
81 34 0 144 422.
Important:
Since, during normal vehicle operation, the vent line and the fuel evaporation
control valve are subjected to fuel vapours (fuel residue remains on the line and
valve), leaks at the fuel evaporation control valve cannot be detected effectively
with devices that react to hydrocarbon hydrates.
SI Diagnosis of fuel tank systems with fuel tank leak diagnosis module (DMTL) All U
BMW AG - TIS
26.01.2013 10:41
Issue status (12/2007) Valid only until next DVD is issued
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