Description - Evaporative Emissions Control System

Fig 1: Locating Evaporative Vacuum Leak Detection System Components

Courtesy of CHRYSLER LLC

1 - FUEL LEVEL SENDING UNIT/PRESSURE SENSOR

2 - FUEL WARNING INDICATOR

3 - INSTRUMENT CLUSTER

4 - MALFUNCTION INDICATOR LAMP

5 - POWERTRAIN CONTROL MODULE

6 - FUEL PUMP RELAY

7 - FUEL FILTER/PRESSURE REGULATOR

8 - FUEL PUMP

9 - FUEL TANK

10 - FUEL VAPOR PRESSURE RELIEF VALVE

11 - EVAP PURGE SOLENOID

12 - EVAP CANISTER

13 - CHARCOAL CANISTER SHUTOFF VALVE

14 - FUEL FILLER CAP

The Evaporation Control System prevents the emission of fuel tank vapors into the atmosphere. When fuel evaporates in the fuel tank, the vapors pass through vent hoses or tubes to an activated carbon filled evaporative canister. The canister temporarily holds the vapors. The Powertrain Control Module (PCM) allows intake manifold vacuum to draw vapors into the combustion chambers during certain operating conditions.

This vehicle uses a pulse-width modulated EVAP Purge Solenoid System. The PCM controls vapor flow by operating the EVAP Purge Solenoid. Refer to EVAP PURGE SOLENOID .

NOTE: The evaporative system uses specially manufactured hoses. If they need replacement, only use fuel resistant hose. Also the hoses must be able to pass an Ozone compliance test.

NOTE: For more information on Onboard Refueling Vapor Recovery (ORVR), refer to FUEL DELIVERY .