Hi I have a 2018 Crv EX manufactured in Ontario Canada. I have a P0456 code for very small Evap system leak and am having issues finding the problem. I tested the purge valve and it is good . I smoke tested the system and found Nothing near the capless fuel fill valve. The only place I did find some smoke rear passenger wheel well and discovered the vent check valve passing. I was able to clean it and it is now sealing. I reset the code and will see if it comes back. I am not optimistic this is the problem but we will wait and see. My next guess is the fuel pump gasket maybe?

What I don’t understand is the Evap vent valve is one of the most common issues for this. So I wanted to test/ replace it but it seems my model does not have this solenoid incorporated in the charcoal canister like it shows on the parts diagram. Where you would typically see the vent valve is open and I see no electrical connector near by. I am wondering if some models do not have a vent solenoid or it is located somewhere else? Anyone else have tips or experienced this before?

 

Smoke will not find most small leaks. We charge the system with nitrogen and spray a mix of 10% Simple Green and 90% water. Spray everything, especially the canister and on top of the tank. In 10 minutes look for the foam. It'll show up.