Common Signs of Damage to Evaporative Emission Control Tanks

Common Signs of Damage to Evaporative Emission Control Tanks

The vehicle’s Evaporative Emission Control System (EVAP) prevents harmful vapors from escaping from the fuel system into the air. The fuel tank exhausts and transports the vapors to the EVAP tank, where the vapors are captured and stored until the engine is started. For this reason, the EVAP reservoir is one of the key components of the system and it is important to know the signs of damage to the evaporative emission control canister.

Evaporative Emission Control Tank Locations
EVAPs have been used in all cars and trucks since the early 1970’s. The evaporative emission control canister is a small container mounted inside a panel or in the corner of the engine compartment. The canister contains activated carbon that absorbs harmful fuel vapors. These vapors remain stored in the filter until the engine gets hot.


Signs of damage to the evaporative emissions control canister
Evaporative Emissions Purge Solenoid Switching Valve (EVAP)
Evaporative emissions control canister damage does not stop harmful vapors from being produced
Here are some symptoms of a damaged evaporative emissions system that can help you catch the problem in time.

Check if the engine light is on
You can check if the engine indicator light on the instrument panel is on
The check engine light on the dashboard starts to come on
The EVAP reservoir is controlled by the car’s computer, which helps monitor the performance of the reservoir valve. If the computer detects that the valve is venting too high or too low, it will automatically illuminate the check engine light. Common error codes you may receive include P0441 and P0446, at which point a warning light on the dashboard informs you of the problem.

The reason for this malfunction is that the EVAP is a closed system that requires a specific pressure. However, if there is a leak or blockage in the system, you will notice the Check Engine light come on.

Poor fuel mileage
Low mileage indicates high consumption or a gas leak in the system. Low fuel mileage can be one of the causes of poor EVAP reservoirs due to a number of factors. In this case, the fuel vapors used in the vehicle’s combustion process are burned before they enter the combustion chamber. As a result, the vehicle gets low gas mileage. However, this problem can be fixed by replacing the EVAP canister.

Poor Engine Performance
Poor EVAP System Causes Vehicle Stalling
Poor EVAP system can also affect engine performance
Aside from low gas mileage, poor engine performance is also one of the symptoms of a poor EVAP canister. This occurs when a faulty EVAP tank causes the combustion process to be incomplete. If the EVAP system components are bad, the vehicle will run slowly even when the pedal is pressed.


Erratic Idle
An erratic vehicle idle is one of the signs of EVAP tank damage. In this case, the vehicle will not maintain the RMP count at highway speeds. As a result, you may feel the vehicle rocking while driving. The normal RMP for a stabilized vehicle is approximately 1000.

In addition to a bad evaporative emissions system, a faulty spark plug, vacuum leaks, and dirty injectors may also be the cause of a rough idle.

Engine Starting Difficulties
If you are experiencing difficulty starting your car’s engine, check the evaporative emissions system for leaks. This usually happens when a damaged charcoal canister causes a vacuum leak in your car. Vacuum leaks allow unmetered air to enter the engine, eventually destroying the air-fuel ratio. If there is more air in the engine, this disruption can lead to improper combustion.

Problems with filling the gas tank
A man is filling his gas tank.
Due to high pressure in the tank, the fuel hose nozzle closes
Fuel fumes pass through the charcoal canister; however, if the canister is clogged, the fumes will not pass through. This situation creates high pressure in the tank, which is why air cannot escape during refueling. In this case, the fuel hose nozzle will close before the tank is filled.

Additionally, a faulty EVAP canister can create a vase gasoline odor in your vehicle due to a cracked charcoal canister or shorted valve circuit.

Now you know the symptoms of a poor quality charcoal canister. Therefore, it is important for those who are willing to reduce their car’s carbon footprint to maintain their vehicles, especially the EVAP system. Moreover, you can also switch to electric cars in UAE. These cars not only help in reducing carbon monoxide emissions but you can also enjoy other benefits of owning an electric car in Dubai.

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