Fuel Pressure Test Port: Testing and Inspection

Checking Filler Cap Pressure Relief Valve

Special tools required:
- 133010
- 161 171
- 16 1172
- 16 1173







Set pressure regulator on special tool 16 1171 fully in "-" direction. Connect special tool 16 1171 via compressed air line (1) to garage compressed air system (8...10 bar).
Connect pressure sensor (2) of Diagnosis and Information System with a measuring range of 0.. .3.5 bar.







Select special tool 16 1172 or 16 1173 matching vehicle's filler cap and attach to quick release coupling of special tool 16 1171. Install filler cap on selected special tool (3).


NOTE: Only the absolute pressure is indicated in the display of the Diagnosis and Information System (018). 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 161171.
Using special tool 13 3 010, disconnect delivery line from special tool 16 1171 to tank filler neck.
Wait 60 secs.
Read off final pressure value and compare with starting pressure value.

Measurement evaluation:







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 161171.

Measurement evaluation: