BMW 7 Owners & Service Manuals

BMW 7 Series: Checking Filler Cap Pressure Relief Valve

Notes

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

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

Connect pressure sensor (2) from Diagnosis and Information System.

Connect special tool 16 1 172 to quick-release coupling (3).

Fuel Tank With Mounting
Fig. 9: Identifying Pressure Sensor, Air Line, Quick Release Coupling And Special Tool

Install fuel filler cap on special tool 16 1 172.

Fuel Tank With Mounting
Fig. 10: Identifying Fuel Filler Cap With Special Tool (16 1 172)

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.

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

Using pressure regulator on special tool 16 1 171, increase pressure by 0.2 bar.

Using special tool 13 3 010 clamp off feed line from special tool 16 1 171.

Read off and note down pressure.

Wait 60 seconds.

Read off pressure again and compare with starting pressure value.

Measurement evaluation:

PRESSURE DROP MEASUREMENT EVALUATION

Fuel Tank With Mounting

Check fuel filler cap pressure relief valve! Select "Measurement/Pressure" function on Diagnosis and Information System (DIS).

Using pressure regulator on special tool 16 1 171, increase pressure by 0.3 bar.

Using special tool 13 3 010 clamp off feed line from special tool 16 1 171.

Read off and note down pressure.

Wait 60 seconds.

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

Measurement evaluation:

PRESSURE DROP MEASUREMENT EVALUATION

Fuel Tank With Mounting

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