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How Evaporative Emission Control Systems Work. A typical system consists of a small canister full of charcoal, valves, hoses, vents in the fuel lines and a sealed fuel tank cap. When fuel evaporates inside the gas tank, the excess vapors are transferred to the charcoal canister. They're stored there until they can safely be transferred back to...
A charcoal canister or EVAP is an essential part of a vehicle. Every vehicle has a fuel tank that emits a flammable gas vapor. When the vehicle is in action, the temperature will rise and its fuel will evaporate then become vapor.
Car manufacturers have devised an internal vehicle system for retaining the harmful fumes until they are completely combusted, called the Evaporative Emission Control System, or EVAP. A main component within this system is the charcoal canister. This container holds gasoline fumes until the engine can burn them through combustion. However, charcoal canisters can seem to fail, requiring a testing procedure to pinpoint the leak within the EVAP system.
Today we remove and test an EVAP charcoal canister. The canister is designed to hold hydrocarbons from the fuel system when the vehicle is not running.
All EVAP systems have a charcoal canister that it relies on. The canister has a huge surface area that is effective in storing vapors from the fuel. If the charcoal canister were to go bad, there would be an array of problems like power reduction, fuel odor, more pinging, lower fuel economy, and flooding.
The EVAP system traps this vapor in a charcoal canister and recirculates it for use as fuel for the engine and prevented from polluting the environment. The canister purge solenoid — also referred to as an EVAP canister valve — is responsible for “purging” the EVAP system by acting as the switch that allows the vapor into the engine.