Okay so I ran a bottle of "Garunteed To Pass" threw my fuel tank the other day. After about 1/2 a tank, my truck pours fuel out from the front end of the passengerside frame rail.

Now it leaks fuel whether the trucks running or not. It's not leaking from any of the fuel lines that I can see. It's not running down the side of the engine or anything. And it stops leaking if I take out the fuel filler cap.

So whatever happened from that fuel treatment, now my truck holds too much vapor pressure. What's wrong and what did I have to fix or replace?

 

Any help? I'm guessing it's the evap canister. Can these be cleaned? If so how? If not, are they junkyard replaceable? Or is it strickly stealership?