6. Test Pressurization of the Fuel Tank System

ECM-4047 CANISTER PURGE (CP) VALVE/CANISTER SHUT OFF VALVE
LEAK DIAGNOSTIC

Test pressurization of the fuel tank system



- Max 50 liters of fuel in the fuel tank.
- Ignition off.
- Connect the hose from the fuel tank to the EVAP canister.
- Clamp the hose between the EVAP canister shut-off valve and the EVAP canister with a hose clip to seal it.
- Carefully disconnect the EVAP canister hose from the canister purge (CP) valve.
Connect manometer 999 5646 to the hose and the pressure regulator 999 5544 to the manometer.
Set the pressure to 7 kPa (Read on manometer 999 5646).
The cock must be at right angles to the hoses.

WARNING! Max 10 kpa.

Let the pressure build up for 5 minutes.
Shut off the cock (the pressure may drop 1 - 2 kPa before stabilizing). Read the pressure.
Turn the cock towards the EVAP canister hose.
Wait for 10 minutes.

WARNING! Never leave the car unattended with its fuel tank system pressurized.

The pressure must be stable (it may rise a little due to fuel evaporation).

Is the pressure stable?
Yes - Continue below.
No - Skip to "Checking the Fuel Tank System"


Checking the hose to the EVAP canister shut-off valve
Check the hose to the EVAP canister shut-off valve. Check the seal. Check the terminals.

Remedy as necessary.

Was a fault detected?
Yes - Continue below.
No - Skip to "Verification information"


Replacing the component



Try a new EVAP canister shut-off valve (C70/S70/V70) according to EVAP Canister Shut-Off Valve, Replacing

Skip to "Verification information"


Checking the fuel tank system



- Ignition off.
- Carefully pressurize the fuel tank system to 7 kpa. The cock must be at right angles to the hoses.

Note! Max 10 kpa.

Check the fuel tank system: Spray soapy water from the EVAP canister to the canister purge (CP) valve. Also spray the line between the fuel tank and the EVAP canister shutoff valve. Also check the filler pipe and the fuel tank filler cap.
It may be necessary to lower the fuel tank in order to fault-trace hoses and connectors on top of the fuel tank.

Remedy the leakage.


Verification information
Hint: After carrying out the check and the repair, check that the fault has been remedied.

Continue with "Starting the Quick Test" 2. Starting the Quick Test