Question on Fuel Tank /EVAP issues

Hello!!
Going to meet with dealership about all the amounting problems with my new Tacoma, but want to make sure I go in a bit educated on the details because I’m expecting to be treated like a lady ‘idiot’ as they have been treating me this whole time.
Bought a brand new Tacoma. Check engine light came on after 3 months, and they diagnosed as “faulty charcoal canister valve” and said it was “stuck in the open position”... so replaced it, did their testing and the codes didn’t clear. Then did some more diagnosing work (dry ice smoke by the fuel lines I think ) and found suspected rat damage to the fuel line... question to you is... would a compromised fuel line cause the canister valve to be stuck open (I hope not)? Or are these two different issues? And if they are different issues... what effects would the rat damage to fuel line have for the truck?

Would the leaking fuel line cause the same check engine code as a code for the canister valve?

The whole headache took them 16 days to discover rat damage (with a completely replaced charcoal canister)...then another 9 days to replace fuel tank... was a long long 25 days without a truck.

Any tips or insight would be greatly appreciated!! Here are the photos the service center sent me..

 

I don't know about the newer tacomas but depending on where that leak is on the system it could pose itself as a leaky canister valve. I would think the tech doing the diagnosing would have checked the lines before blindly replacing expensive components. If it's the same as the 2nd gen gas tank the canister valve leakby would have presented itself by a vacuum leak when doing the test after engine shutdown so there are standard things to look at based on that code.

 

Thanks so much!

 

That will do it.

 

You can read up on the attached, it is for a 2nd gen but I believe the 3rd gen will work the same exact way. If one of the lines is compromised, when it does the EVAP test, it will fail since it can't draw the vacuum. This could be a failure of the vent valve stuck "open" or "off", or any number of the lines that connect from the tank to the charcoal canister.

for the trouble areas it tells you to check the following:
Canister pump module
Connector/wire harness (Canister pump module - ECM)
ECM
Leakage from EVAP system

 

The evap. system is one that is closely monitored for integrity since its purpose is to prevent the leaking of gas fumes into the atmosphere. Any leak in the system, including a loose or bad gas cap, will cause a problem and MIL if the computer does not see the required vacuum or pressure it is expecting in the time it expects to see it.The computer can detect that it's a small, or large leak and a small leak can be very small .

 

Amazing what you can find on the internet. Same situation for me right down the suspected rat. Coincidence? I had a check engine light on and they did exactly what you said @Ttthawaii. $2000 to replace the fuel tank because of this. Why isn't this line removable? Insane.