Rev. B
Workman MDXPage 3 -- 18Briggs & Stratton Gasoline Engine
Fuel Evaporative Control System (Serial Number Above 310000000)
Figure 18
CHECK
VALVE
FRESH AIR
FILTER
CARBON
CANISTER
FUEL
TANK
ENGINE
TO INT AKE
MANIFOLD
ROLLOVER
VALVE
Workman MDX vehicles with serial number above
310000000 are equipped with a fuel evaporative control
system (EVAP) designed to collect and store evapora-
tive emissions from the fuel tank. The EVAP uses a car-
bon canister to collect these evaporative emissions.
Fuel vapors from the fuel tank are vented to the canister
where they are stored. Vapors from the canister are con-
sumed when the engine is running which purges the
canister.
The fuel tank on these Workman vehicles 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.
NOTE: If there is restriction in the fresh air filter, the car-
bon canister or the rollover 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.
Machines with a carbon canister include a single engine
connection to the engine intake system that is used to
connect the evaporative system to the engine. These
machines use an inline check valve between the carbon
canister and the engine fitting. Evaporative control sys-
tem components for Workman MDX vehicles are shown
in Figure 19.
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