So on this fuel cap, pressurization issue.....this is my setup. Stock fj62 tank, filler neck and fuel door is stock '72 FJ55 along with the fuel cap. My old fuel cap has no venting like the newer fj62's have so I am guessing after I put 5 gallons in it the other day and put the old fuel cap on the fuel sloshing around pressurized the tank. I pulled it in garage and walked away so that air pushed the fuel up the filler neck to the cap and it leaked. As soon as I removed the fuel cap the level started to receed down the filler tube. So for now I drilled a couple holes in my fuel cap (I know, not cool) but I have a parts rig 4runner that I am going to see if I can adapt that filler neck and new style, vented fuel cap and see what happens. I could be way off base here as I've never dealt with this evap stuff much. I am going to checkout that other thread too that was posted a few days ago and see what I can learn. Thanks all