Chrysler Emission Controls

This evaporative emissions system leak detection pump filter is designed to match the fit and function of the original filter on specified applications, and is engineered for reliable performance and durability.

Carquest Evaporative Emissions System Leak Detection Pump Filter, VDC1201.

Relays are electrical switches used to convert a small electrical load into a circuit capable of handling a high amperage load. Computers and small switches are not designed to carry the higher amperage requirement of a circuit that may have an electric motor, solenoid, or high amperage lighting fixture. Within a relay are contacts that are controlled with electromagnetism, when the circuit switch commands the device on or off, magnetism will pull or release the contact arm closing or opening the contacts within the relay that carry the voltage.

The Evaporative Emission System is designed to control fuel vapors in the vehicle fuel storage system to prevent any release of fuel vapors into the atmosphere. In a normally operating system, released vapors from the fuel storage tank will be directed into an on-board charcoal canister via a piping system and control valves. Under the most ideal engine operating condition, the vapors will be pulled into the engine to be burned during the normal combustion process. The leak detection pump uses naturally changing vacuum due to temperature change as well as the pressure change during the normal evaporative purge process to transition a normally open vacuum switch indicating normal operation or system failure.