Operation; Evaporative Emission Control System - Ford Ranger Maintaince And Repair Manual

5. To install, attach the PCV vacuum hose to the PCV valve, then insert the valve into its mounting
grommet.

Evaporative Emission Control System

OPERATION

Fuel vapors trapped in the sealed fuel tank are vented through the orifice vapor valve assembly in the top of
the tank. The vapors leave the valve assembly through a single vapor line and continue to the carbon canister
for storage until they are purged to the engine for burning.
Purging the carbon canister removes the fuel vapor stored in the carbon canister. The fuel vapor is purged via
a CANister Purge (CANP) solenoid or vacuum controlled purge valve. Purging occurs when the engine is at
normal operating temperature and off idle.
The evaporative emission control system consists of the following components: fuel vapor (charcoal) canister,
orificed vapor valve, fuel vapor CANister Purge (CANP) solenoid, pressure/vacuum relief fuel tank filler cap,
Evaporative Emission Control System
HOW TO USE THIS BOOK
PCV system hose routing for the 4.0L engine
Click to enlarge
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