Canister Inspection; Safety Valve Check - VESPA 946 E4 EMEA 2021 Manual

Maintenance
Refit the canister support bracket on the chassis
and tighten the fastening screws.
Locking torques (N*m)
Canister - Frame support bracket

Canister inspection

The canister is essential to treat the hydrocarbons present in the volume of gas that escapes from the
tank when there is an increase in internal pressure (tank heating induced by the cooling radiator, by the
motor or by the external environment).
The volume of air is limited by the operation of the ventilation valve (Roll-over).
Although the amount of hydrocarbons coming from the tank is small enough to avoid the saturation of
the canister, it is necessary to regenerate the activated carbon by means of a reversed flow of ambient
air sucked by the engine.
These vacuums of pollution and carbon regeneration take place at each cycle of use of the vehicle.
To control the canister, it is necessary to proceed
with its removal while keeping the 2 pipes connec-
ted.
•
Shake the Canister and make sure
there is no noise.
•
Using a compressed air gun, blow al-
ternately in 3 ducts and make sure that
pressure does not build inside the can-
ister.
•
Check that the air flow is kept free and
that no carbon residues escape out of
any pipe.
If you detect noise, clogging or loss of carbon, re-
place the canister.

Safety valve check

The cleaning of the canister is achieved via a controlled flow of air from the vacuum socket in the intake
manifold.
MAIN - 66
Vespa 946 E4-E5 EMEA-USA-ASIA (2021-)
12.0 ± 1.0 Nm