16 11 130 Checking filler cap pressure relief valve

WARNING: This page is about a different car, the 2003 BMW Z8, 2002 BMW Z8, 2001 BMW Z8, and 2000 BMW Z8. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

13 3 010
16 1 171
16 1 172
16 1 173

Set pressure regulator on special tool 16 1 171 fully in "-" direction.

Connect special tool 16 1 171 via compressed air line (1) to garage compressed air system (8...10 bar).

Fig 1: Identifying Compressed Air Line

Courtesy of BMW OF NORTH AMERICA, INC.

Connect pressure sensor (2) of Diagnosis and Information System with a measuring range of 0...3.5 bar.

Select special tool 16 1 172 or 16 1 173 matching vehicle's filler cap and attach to quick release coupling of special tool 16 1 171.

Fig 2: Identifying Special Tool

Courtesy of BMW OF NORTH AMERICA, INC.

Install filler cap on selected special tool (3).

NOTE: Only the absolute pressure is indicated in the display of the Diagnosis and Information System (DIS). The current ambient air pressure is already displayed without additional pressurization.

Check testing equipment for leaks!

Select "Measurement" function on Diagnosis and Information System (DIS).

Set measuring range according to pressure sensor to 0-3.5 bar.

Increase pressure by 0.2 bar with pressure regulator on special tool 16 1 171.

Using special tool 13 3 010, disconnect delivery line from special tool 16 1 171 to tank filler neck.

Wait 60 secs.

Read off final pressure value and compare with starting pressure value.

Measurement evaluation:

MEASUREMENT EVALUATION

Pressure drop > 0.012 bar

Testing equipment leaking. Check connection points for leaks.

Check filler cap pressure relief!

Follow same test procedure as for "Checking testing equipment for leaks".

Increase pressure by 0.3 bar with pressure regulator on special tool 16 1 171.

Measurement evaluation:

MEASUREMENT EVALUATION

Pressure drop > 0.012 bar

Filler cap pressure relief valve faulty. Replace filler cap.