Toro 41188, Service Manual

Page: 32 / 353

Multi Pro 1750 Page 3 − 14 Kohler Gasoline Engine
Carbon Canister
Figure 9
TO INTAKE
MANIFOLD
1. Fuel tank assembly
2. Carbon canister
3. Fresh air filter
4. Vacuum check valve
5. Engine
6. Vapor hose (tank to canister) 7. Vapor hose (canister to check valve)
8. Vapor hose (check valve to engine)
1
2
3
4
5
6
7
8
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
Multi Pro 1750 machines uses a carbon canister to col-
lect these evaporative emissions. Fuel vapors from the
fuel tank are vented to the canister when the engine is
not running. When the engine is running, vapors from
the canister are consumed by the engine.
The fuel tank on Multi Pro 1750 machines uses a non−
vented fuel cap. To connect the tank to the evaporative
control system, a rollover valve is positioned in the top
of the tank that allows the tank to vent to the carbon can-
ister.
The carbon canister is mounted next to the fuel tank.
The engine draws fuel vapor from the carbon canister
through an in−line check valve and a hose connected to
the engine intake manifold. The check valve is marked
with an arrow indicating the direction of flow (to the en-
gine intake manifold) to assure proper installation.
NOTE: If there is restriction in the fresh air filter, the car-
bon canister or the fuel vent valve, the fuel tank may dis-
tort 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.
1. Park vehicle on a level surface, engage parking
brake, stop the engine and remove key from ignition
switch.
DANGER
Gasoline is flammable. Use caution when stor-
ing or handling it. Do not smoke while filling the
fuel tank. Do not fill fuel tank while engine is run-
ning or in an enclosed area. Always fill fuel tank
outside and wipe up any spilled fuel before start-
ing the engine. Store fuel in a clean, safety−ap-
proved container and keep the cap in place. Use
gasoline for the engine only; not for any other
purpose.
2. Inspect carbon cannister and attached hoses for
damage or obvious leaks. A damaged or leaking cannis-
ter should be replaced.
3. Replace fuel evaporative control system compon-
ents as needed (Fig. 7 and 9). Note hose routing and lo-
cation of clamps and cable ties.
4. Make sure that fuel hoses are secured with hose
clamps, anchor clamps or cable ties as noted. Check
hose connections at carbon canister for correct system
operation.