I guess the pictures tell the story. The weeping rivet on the backside of the tank showed up after the first tank fill. I had pressure tested the tank, but it happens. I’ll get this fixed this week and hopefully back on by the weekend. Removing the tank took about 1.5 hours. I expect replacing to take twice as long. Tonight I’ll get the tank pressured up and dunk it a water tank. That should allow me to pinpoint the problem and develop a plan of attack.

Last night I pressured up the tank and found the leak using leak detecting liquid (Snoop). In the pictures it looks like a rivet leak but it is actually right between two rivets. I checked the rest of the tank and could find no evidence of any other leaks with the snoop. I left the tank pressurized over night and this morning the ballon was just as inflated as I left it 12 hours ago. This is a pretty tiny leak but pesty enough to fix.

I plan to pull a vacuum on the tank and then use Loctite 290 to flow into the void. Loctite 290 is a wicking thread sealant that stands up to leaded petro. I have read of others on the Vans Airforce forum who have successfully fixed weepers using this technique. If this doesn’t work, plan B will be more agressive, cutting into the tank and sealing with pro-seal from the inside, then patching the cut out. Hope I don’t have to go that way.