Mechanical Troubleshooting Manual For The Tank Leak Diagnosis: Notes

This troubleshooting manual indicates all fault locations that are currently known where a leak might occur.

Check connections on the fuel tank and lever sensor for leaks. 

Fig 1: Checking Connections On Fuel Tank And Lever Sensor For Leaks

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Check the connections on the carbon canister and check the carbon canister for leaks, if applicable. 

Fig 2: Checking Connections On Carbon Canister

Courtesy of BMW OF NORTH AMERICA, INC.