Here is the text from the Helm manual.
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Here is a picture of the evaporative emissions canister:
Here is some reading...
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, as well as, the fuel tank and fuel tank filler pipe, vapor tube and fuel vapor hoses.
Fuel Vapor (Charcoal) Canister
NOTE: The fuel vapor canister is referred to as the evaporative emissions canister on 1995–99 models.
The fuel vapors from the fuel tank are stored in the fuel vapor canister until the vehicle is operated, at which time, the vapors will purge from the canister into the engine for consumption. The fuel vapor canister contains activated carbon, which absorbs the fuel vapor. The canister is located in the engine compartment or along the frame rail.
Orificed Vapor Valve
NOTE: This component is also known as the evaporative emission valve on 1995–99 models.
Fuel vapor in the fuel tank is vented to the carbon canister through the vapor valve assembly. The valve is mounted in a rubber grommet at a central location in the upper surface of the fuel tank. A vapor space between the fuel level and the tank upper surface is combined with a small orifice and float shut-off valve in the vapor valve assembly to prevent liquid fuel from passing to the carbon canister. The vapor space also allows for thermal expansion of the fuel.
CANP Solenoid
The CANP solenoid is inline with the carbon canister and controls the flow of fuel vapors out of the canister. It is normally closed. When the engine is shut OFF, the vapors from the fuel tank flow into the canister. After the engine is started, the solenoid is engaged and opens, purging the vapors into the engine. With the solenoid open, vapors from the fuel tank are routed directly into the engine.
Pressure/Vacuum Relief Fuel Tank Filler Cap
The fuel cap contains an integral pressure and vacuum relief valve. The vacuum valve acts to allow air into the fuel tank to replace the fuel as it is used, while preventing vapors from escaping the tank through the atmosphere. The vacuum relief valve opens after a vacuum of–0.25 psi (1.7 kPa). The pressure valve acts as a backup pressure relief valve in the event the normal venting system is overcome by excessive generation of internal pressure or restriction of the normal venting system. The pressure relief is 2 psi (14 kPa). Fill cap damage or contamination that stops the pressure vacuum valve from working may result in deformation of the fuel tank.
Here:
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go to "auto repair reference center"
Exactly the same on my 98 XLT Ex.
