Toro Workman GTX Service Manual page 37

Workman GTX vehicles are equipped with a fuel evapo-
rative control system (EVAP) designed to collect and
store evaporative emissions from the fuel tank. The
EVAP system on machines with electronic fuel injection
(EFI) collect and store evaporative emissions from the
electric fuel pump as well. This system uses a carbon
canister to collect these evaporative emissions. Fuel va-
pors from the fuel tank are vented to the canister where
they are stored. Vapors from the canister are consumed
when the engine is running which purges the canister.
The fuel tank on the Workman GTX vehicle 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 tank venting through the carbon
canister. The EVAP system also includes an in- line
check valve (CV cartridge) that is inserted in the hose
between the carbon canister and the carburetor EVAP
fitting. Evaporative control system components for
Workman GTX vehicles are shown in Figure 16.
NOTE: If there is restriction in the carbon canister, the
rollover valve or the fresh air filter mounted below 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.
Disassembly
CAUTION
Read safety precautions for handling gasoline
before working on the fuel system (see Safety In-
structions in Chapter 1 - Safety).
1. Park machine on a level surface, stop the engine, en-
gage parking brake and remove the key from the key
switch.
2. Remove seat base assembly from vehicle.
3. Inspect carbon cannister and attached hoses for
damage or obvious leaks. A damaged or leaking cannis-
ter should be replaced.
4. Remove EVAP components as needed using Fig-
ures 16 and 17 as guides.
A. If hoses are removed from the carbon canister,
note hose location for assembly purposes. Figure 17
identifies hose location.
B. The orifice adapter (item 11 in Fig. 16) has a larg-
er OD for the hose from the canister and a smaller
OD for the hose to the carburetor. Record the orien-
tation of the orifice adapter for assembly purposes.
Workman GTX Gasoline
C. The CV cartridge (item 9 in Fig. 16) is installed in-
side the hose between the canister and the orifice
adapter. If this hose (item 11 in Fig. 16) is removed,
mark the hose so that it can be installed in the correct
direction. Air flow through the hose should be al-
lowed toward the carburetor and not toward the can-
ister when the hose with cartridge is orientated
correctly.
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1. Top of carbon canister
2. Fitting to rollover valve
5. If the CV cartridge is faulty, either air movement will
be allowed through the hose in both directions (valve is
open) or in neither direction (valve is plugged). If neces-
sary, replace the CV cartridge and the hose. Insert new
CV cartridge into the new hose in the direction shown in
Figure 16.
IMPORTANT: A plugged carbon canister or fresh air
filter can cause fuel pressure problems that result in
poor engine performance and also can lead to fail-
ure of the fuel pump.
Assembly
1. Install all removed EVAP components using Figures
16 and 17 as guides.
A. If the hose with CV cartridge was removed, use
mark made during disassembly to install the hose in
the correct direction.
B. Make sure that all evaporative system fuel hoses
are not kinked after installation.
2. Install seat base assembly to vehicle.
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Figure 17
3. Fitting to engine
Gasoline Engine
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