Q: possible evap charcoal canister

asked by on

By the gas cap there is a black like charcoal substance that looks as if maybe an over flow as well. The cel isnt on nor do i smell gas, not sure if i have over filled gas tank please help
My car has an automatic transmission.

I’ve not heard of charcoal appearing by the filler neck before, but I have seen canisters break up and regurgitate their contents into the connecting hoses, so I suppose its possible that what you are seeing is charcoal from the canister. If you are in the habit of topping off your gas tank, that might be a contributing factor. Many people like to fill their tank all the way up the neck and that can potentially fill the canister with fuel. The canister is designed for fuel vapor and is not built to be full of liquid gas. From now on, when you fill the tank, just run it until the pump shuts off, and don’t continue to pull the trigger. That leaves enough airspace in the tank for the fuel to expand when it’s hot without flowing up into the lines and canister. If you’re not experiencing any other symptoms, it probably won’t cause any other problems, but if you smell fuel or see puddles, you should contact YourMechanic and get them to send a technician out to look things over.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. possible evap charcoal canister

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Car wont start 2011 VW CC

Hello - first task is to extract the problem code(s). There is a problem with the the engine/transmission setting the "Check Engine" (the wrench symbol), but only the codes will guide you to what specific problem needs attention. Given the...

Q: My key will not go into the ignition. When i look into the hole something is blocking it. Is there a cheap fix?

The ignition lock tumblers have fallen down and blocked the key. You can try and get a small thin pick or similar device and try and push the tumbler back up in place and put the key in. If you...

Q: Q: Fuel tank leaking

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.