Originally Posted by fergy
What are the problems with the tank? rust I assume? Flakey rust or just brown coating?
I used the acid method and then treated the tank with phosphoric acid (navel jelly) but had to rinse the tank afterward, flushing with water hose to remove the residue from the navel jelly. I had removed all the stuff off the tank, which I'm sure you have also. (petcock, fuel sensor, gas cap) I used an older blow dryer of my wife's, and used it on the warm, not hot setting. I duct taped it to the gas cap hole and sat the tank on it's side for a while, then on it's end, then other side, you get the picture. I let it run for over an hour just to make sure it was dry.
My tank was crusty inside and the acid method restored it to like new. It still is silver inside after nearly a year.
Actually, I'm not sure what the problem is. Originally, the tank was leaking at the base (rust), and the previous owner brazed it and repainted. I got the bike, and it was still leaking at the base, beween the flange with the bolt hole and the bottom of the tank. I sealed with JB Weld.
The summer was too busy or hot to work on the bike (I know you Texans would say "That ain't hot..."
) with vacations, insane work schedules etc. So it sat with about 1/3 or a tank of gas and SeaFoam in it. I got a chance to go for a quick ride, I filled it up, and noticed the carbs were not right. So I pulled the air cleaner and was blasting with carb cleaner, and noticed a puff of smoke coming from the left side about every 10-20 seconds. I went over there and saw that gas was leaking on the exhaust pipe. At first, I thought it might be the petcock, but when I pulled the tank and drained it, I saw the paint was bubbled by the front left mounting flange.
I dremelled all of the paint off, but could not get the tank to leak again, nor could I see the source of the leak. So I decided at this point, sealing it from the inside was kinda like nuking it from orbit: Its the only way to be sure.
Got my POR15 kit and have been workin to get it done.