Fuel Evaporative Control System - Toro Workman HDX Auto Service Manual

Fuel Evaporative Control System

CARBON
CANISTER
TO ENGINE
PURGE PORT
FRESH AIR
FILTER
Your Workman vehicle is equipped with a fuel evapora-
tive control system (EVAP) designed to collect and store
evaporative emissions from the fuel tank. The EVAP
uses a carbon canister to collect these evaporative
emissions. Fuel vapors from the fuel tank are vented to
the canister where they are stored. Vapors from the can-
ister are consumed when the engine is running which
purges the canister. Evaporative control system com-
ponents for Workman vehicles are shown in Figure 10.
The fuel tank on your Workman uses a non−vented fuel
cap. To connect the tank to the evaporative control sys-
tem, a rollover valve is positioned in the top of the tank
that allows tank venting through the carbon canister.
NOTE: If there is restriction in the carbon canister, the
rollover valve or the fresh air filter connected to the bot-
tom of the carbon canister, the fuel tank may distort due
to venting issues. If the fuel tank returns to it's normal
shape when the fuel cap is removed, restriction in the
evaporative control system is likely.
Kohler Gasoline Engine
FUEL
VENT HOSE
FUEL
SUPPLY HOSE
VACUUM
CHECK
VALVE
Figure 10
Page 3 − 10
ROLLOVER
VALVE
Workman vehicles with a carbon canister include a
single engine connection to the engine intake system
that is used to connect the evaporative system to the en-
gine. These machines use an in−line check valve
between the carbon canister and the engine fitting.
CARBON CANISTER CONNECTIONS
Figure 11
FUEL
TANK
TO ROLLOVER VALVE
TO VACUUM CHECK VALVE
AND ENGINE PURGE PORT
Workman HDX Auto