Gasoline Engine Page 3 - 4 Sand Pro 2040Z
Fuel Evaporative Control System
Figure 1
FRESH AIR
FILTER
CARBON
CANISTER
FUEL
TANK
ENGINE
CONTROL
VALVE
TO INTAKE
MANIFOLD
VACUUM
TO AIR
INTAKE TUBE
AIR INTA KE
TUBE FITTING
LOCATION
INTAKE
MANIFOLD
FITTING
The function of the fuel evaporative control system is to
collect and store evaporative emissions from the fuel
tank and engine. The evaporate control system used on
Sand Pro 2040Z machines uses a carbon canister to
collect these evaporative emissions. Fuel vapors from
the fuel tank are vented to the canister when the engine
is not running. Vapors from the canister are consumed
when the engine is running.
The fuel tank on Sand Pro 2040Z machines uses a non-
vented fuel cap. A vacuum control valve located above
the fuel t ank is used to control evaporative emission flow
through the system. The carbon canister is connected
to both the fuel tank vent and the vacuum control valve.
When the engine is running, engine intake vacuum un-
seats the vacuum control valve which then allows va-
pors from the canister to the engine air intake tube.
These vapors are then consumed during engine opera-
tion. When the engine is not running, evaporative va-
pors remain in the fuel tank and carbon canister.
NOTE: If there is restriction in the fresh air filter, the car-
bon canister, the vacuum control valve or hoses in the
evaporative control system, the fuel tank may distort
due to venting issues. If the fuel tank returns to it’s nor-
mal shape when the fuel cap is removed, restriction in
the evaporative control system is likely.
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