Fuel Tank Cap; Evaporative Emission Control System; Charging; Purging - Honda GC160 Service Manual

gc160_gcaha_3599750_3721672
GC160
6. FUEL SYSTEM
GC190 • GS190

1. FUEL TANK CAP.................................... 6-1

1. FUEL TANK CAP

EVAPORATIVE EMISSION CONTROL SYSTEM

These engines have an EVAPORATIVE EMISSION CONTROL CANISTER built into the fuel tank cap to prevent the
escape of gasoline vapors into the atmosphere.
PRINCIPLE

CHARGING:

Gasoline vapor produced in the fuel tank at high ambient
temperature is absorbed and stored by the charcoal in the canister,
which is built into the fuel tank cap.

PURGING:

When the pressure in the fuel tank decreases because of low
ambient temperature or consumption of gasoline, the air drawn
through the canister releases the stored gasoline vapor from the
charcoal. The released gasoline vapor returns to the fuel tank.