If you have ever wondered how to test an EVAP system at home, here is a step by step guide. This process is called a smoke test.
First, you will need to locate the EVAP canister. This is usually located near the gas tank. Once you have found it, remove the cap and look for the small hole in the center of the canister.
Next, take a piece of tubing and attach it to the hole in the canister. The other end of the tubing should be placed in a container of water.
Now, begin the car and let it idle for a few minutes. Then, turn off the engine and disconnect the negative battery terminal. This will prevent any sparks from occurring while you are working on the EVAP system.
Now, reconnect the negative battery terminal and start up your car again. Allow it to idle for a few more minutes so that pressure can build up in the EVAP system. You should now see bubbles coming out of the tubing and into your container of water. These bubbles indicate that there are no leaks in your EVAP system!