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3-Series (E46)

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  1. Remove screws and panel. Remove expansion rivet and panel. See Fig 1. Unlock line and detach line from dust filter. See Fig 2. Seal dust filter with special tool. Remove tank filler cap and connect Special Tool (16 1 150) to tank filler neck. See Fig 3. Screw in rear towing eye and hook Special Tool (16 1 150) into it. Connect special tool to workshop compressed air system of 116-145 psi (8-10 bar) with compressed air hose. See Fig 4. Connect pressure sensor with measuring range of 0-51 psi (0-3.5 bar).
    NOTE: Ensure pressure regulator on Special Tool (16 1 150) is set completely in "-" direction and non-return cock between pressure regulator and pressure sensor is closed. Select "Measuring Technology" function on Diagnosis Information System (DIS).
  2. Set measuring range in accordance with pressure sensor to 0-51 psi (0-3.5 bar). Open non-return cock on Special Tool (16 1 150) and increase pressure in tank system by.72 psi (.050 bar) with the pressure regulator.
    WARNING: Do not increase pressure by more than 1.45 psi (100 bar), as damage to fuel tank and tank ventilation system is possible.
  3. Close non-return cock. Wait about 20 seconds for system to settle. Read off pressure value, then wait 60 seconds. Read off final pressure value and compare with starting pressure value. If pressure drop within range of.116-1.7 psi (.008-.12 bar), measurement must be repeated to obtain a confirming result. If pressure drop in 60 seconds is greater than.145 psi (.010 bar), system is leaking.
  4. Leak test can be carried out with a leak detector. Possible causes may be fuel filler cap leaking, tank ventilation line leaking (fuel tank-activated carbon canister-tank ventilation valve), tank ventilation valve leaking (engine compartment), tank sensor on fuel tank leaking or activated carbon canister non-return valve leaking (spare wheel recess).
Fig 1: Removing Under Car Panels
G00131596Courtesy of BMW OF NORTH AMERICA, INC.
Fig 2: Disconnecting Line From Dust Filter
G00131597Courtesy of BMW OF NORTH AMERICA, INC.
Fig 3: Removing Tank Filler Cap & Installing Special Tool
G00131598Courtesy of BMW OF NORTH AMERICA, INC.
Fig 4: Installing Compressed Air Hose & Pressure Sensor
G00131599Courtesy of BMW OF NORTH AMERICA, INC.
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