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Jeep Wrangler Vapor Canister

Knowing What is Wrong with the Jeep Wrangler Vapor Canister

The Jeep Wrangler vapor canister is the heart of the Evaporative Emission Control System or EVAP system, and it consists of activated carbon. This substance has a granular structure through which it stores the fuel vapors that would otherwise escape and pollute the atmosphere. The purge valve, then, purges out the raw fuel back into the combustion process for recycling. If something goes wrong with the vapor canister, your vehicle's performance and drivability will suffer. That's why it is important to know what is wrong with the part. Here are a few symptoms:

Fuel odor

The vapor canister has a filter at its base end. If the filter is clogged, the smell of the fuel will be emanating from vapor canister. Also, if you are used to overfilling your fuel tank, the vapor canister will end up getting soaked with gasoline, letting out that distinct fuel odor.

Wet bleeder hose

When the vapor canister is failing, the bleeder hose that is found on top of the vapor canister will be wet with fuel. The bleeder hose is bent upward and then downward to prevent siphoning action from the fuel tank. Simply stick your finger at the end of the bleeder hose to see if it is indeed wet with fuel.


When you notice fuel pouring out of the canister when it is running, the Jeep Wrangler vapor canister will no longer function and should be replaced. The outpour may be caused by the pressure or vacuum buildup in the fuel tank, especially when a faulty or wrong fuel tank cap is used. Take off the fuel tank cap and start your vehicle again. If there is no longer any fuel pouring out of the vapor canister, the wrong or faulty cap is the cause of the problem. This symptom is also quite dangerous because it can cause a fire, so it is imperative to replace it immediately.


This problem can be caused by a defective purge valve. When the purge valve goes bad, it causes leaking in one of the hoses. Sometimes, the leaks can be as tiny as a pin prick, and one way to discover this is by using a smoke machine.

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  • Easy Tips to Keep Jeep Wrangler Vapor Canister in Top Condition

    The Jeep Wrangler vapor canister in your vehicle helps you achieve better fuel mileage and pass emissions tests. Without it, your Jeep will be letting out pollutants in every drive. Besides this, you'll also be running your car inefficiently. And although it doesn't actually require periodic maintenance, it is still important to take care of it. Here are a few easy tips to keep it in top condition:

    Don't overfill fuel tank and radiator.

    Not filling up the fuel tank to the brim is a good practice you should hold on to. The same is true when it comes to the radiator. Filling the tank and the radiator to the top may cause flooding in the canister. And when it has been flooded with fuel, it can no longer be repaired or restored.

    Change filters regularly.

    Although the charcoal in the vapor canister will continue to absorb fuel vapors for the entire lifespan of the vehicle, the filters that come with the assembly should be changed periodically. This is so that there will be clear movements of the vapors from the canister back to the engine.

    Clean canister.

    Over time, fume buildup can clog the canister and prevent the vapors from entering and leaving it. You can clean up it up and remove the clogs with an air compressor. Place the ends of two of your fingers over the openings found on top of the canister. Then, insert the rubber tip of an air line nozzle on the outer control pipe. This is where the 50 psi of air will blow into from the compressor. Release the trigger of the nozzle and let the air blow into it for two minutes. Afterwards, check if there is air flowing out of the bottom pipe of the canister.

    Use appropriate fuel tank cap.

    Make sure you use the correct fuel tank cap to allow proper ventilation in the fuel tank. If the gas vent is plugged or the fuel tank cap is not the exact match of the original, you will face problems such as a flooded vapor canister and/or a quitting engine. This is because of the vacuum created or the amount of pressure that builds up inside the fuel tank. On one hand, the combined fuel tank pressure and the vapor pressure may force the fuel up to the canister and cause flooding. On the other, the engine can completely die because of the vacuum in the fuel tank, causing fuel starvation.