Fuel Tank: Testing and Inspection

Test pressurizing the tank system

Special tools:
999 5646 Pressure gauge 999 5646 Pressure Gauge
999 5544 REGULATOR 999 5544 Regulator

Safety
First read Safety regulations for handling fuel Safety Regulations for Handling Fuel.

Note! The tank must not be more than 85% full when test pressurizing.

Preparation




Ignition off.
Block the hose between the leak diagnostic module and the leak diagnostic module filter by clamping the hose using hose clips.

Connecting the manometer




Expose the canister purge (CP) valve.
Disconnect the hose (1) between the EVAP canister and the EVAP canister purge valve.
Connect manometer 999 5646 Pressure gauge 999 5646 Pressure Gauge to the hose (1) and the pressure regulator 999 5544 REGULATOR 999 5544 Regulator to the manometer.

Caution! The cock should face the pressure regulator.

Connect compressed air to the pressure regulator
Set the pressure to a maximum of 7 kPa (read off from manometer 999 5646).
Pressurize the fuel tank system by turning the cock at right angles to the hoses.
Allow pressure to build up in the tank system.
Check that the system does not leak.
Stop the pressurization by turning the cock towards the hose (1) as illustrated in A.

Note! A certain amount of leakage may occur from the leak diagnostic unit. The pressure may therefore drop when the pressurization is stopped. This is normal. The leakage is caused because the pressurization is not carried out using the leak diagnostic unit.

Caution! Never leave the car unattended with the tank system pressurized

Resetting
Remove the manometer. Reconnect the hose to the EVAP canister purge valve.
Remove the hose clip from the hose to the filter.