The charcoal canister or vapor canister is usually located under the vehicle, often very close to the fuel tank. This released vapor gets pushed through the canister’s vent line and purge valve into the engine, where the vapor gets burnt off. The charcoal in the canister has been engineered to be extra absorbent, making it especially effective at absorbing the vapor given off by your fuel.Īs this vapor builds up inside the canister over time, it will reach a point where it needs to release some of it. Instead of these fumes being vented out into the atmosphere – which isn’t very eco-friendly – they’re absorbed by your charcoal canister. The charcoal canister or vapor canister works by absorbing the fumes that the fuel in your tank produces as a byproduct. If so, then this would also point toward a fault with the canister. Although it’s uncommon for a charcoal canister to be causing excessive smoke, it would be wrong to say that it never happens!Īn easy test would be to blank the vent pipe from the charcoal canister and see if the exhaust smoke changes. This misfueling could be a result of your charcoal canister not operating as it’s designed to. If your exhaust has started excessively smoking, this could indicate that your engine is being misfueled. Excessive Smoke From ExhaustĪs with any fault on your vehicle that causes the engine to misfuel, your exhaust will often put out various colors of smoke depending on what the fault is. If so, this would indicate a faulty fuel canister that needs to be replaced for your vehicle to fall under emission regulations. You can try blanking off the fuel canister’s vent pipe and see if doing this affects your vehicle’s emissions. This can be difficult to find, as the fuel canister tends only to work passively. If your fuel canister is faulty, it could be misfueling your engine and therefore cause your vehicle to fail its emissions test as a result. During this test, your vehicle’s emission levels are checked to ensure that the fumes that exit the exhaust are meeting regulations. Many countries and states have yearly emission tests that you need to pass for your car to be legal on the streets. If you’re noticing a strong fuel smell from your vehicle, even when it’s not running, then your charcoal canister is a good place to start in the diagnostic process. This fuel vapor has a strong smell that will be noticeable when the engine is running and also when the engine is switched off. Instead of being stored inside the canister before being sent through the vent pipe and the purge valve, a damaged canister body could result in the vapor being released into the atmosphere. If your charcoal canister has a split in the body, this can cause the canister to lose its stored fuel vapor. This is most noticeable when you are about to refuel your car, and you hear a lot of air going out or into the fuel tank when you open the fuel tank cap, which creates a hissing noise.Ī little bit of under or overpressure in your fuel tank is fine, but if it seems to be a lot more than usual, you do probably have a problem with the EVAP system. Hissing Noise when you open the fuel tank capįor the same reason mentioned before, when the charcoal canister is clogged, it will create a higher overpressure or underpressure in the fuel tank than usual. This will cause the fuel hose nozzle to shut off, and it can even cause the fuel to pour out everywhere except in the fuel tank. If the charcoal canister or fuel vapor vent line is clogged, the air will not be able to flow out when you pour fuel in. Fuel goes into the tank, and therefore gases and air needs to go out. The same applies when you refuel your car. This will create high pressure in the fuel tank. The fuel fumes are going through the charcoal canister, and if the canister is clogged, the fumes will struggle to pass. To know exactly why the check engine light is showing up, you need to use a diagnostic scanner to check the trouble codes. If the engine control unit notices that there is a leak in the system or if it is clogged, the check engine light will show up. The EVAP system is a closed system that needs to hold a specific pressure. This is exactly what can happen if the charcoal canister has gone bad. The engine control unit is constantly monitoring all sensors in your car engine, and if one fails, it will store a trouble code and show a check engine light on the dashboard to notify you that something is not as it should be. Here is a more detailed list of the signs of a bad or failing charcoal vapor canister to look for: 1. You can also hear a hissing noise when opening the fuel tank cap. You may also find it difficult to fill up the fuel tank at the gas station without making a mess. The most common symptom of a bad charcoal canister is a check engine light on your dashboard. Charcoal Canister Replacement Cost Symptoms Of A Bad Charcoal Vapor Canister
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