After pulling the tank I cleaned it up and sure enough… there was the leak, a crack on the bottom about 8 inches long. Actually it was only leaking from about 2 inches of the crack. Last night I tested a dab of some Gorilla Glue I had on the tank and this morning it looked pretty good and seemed to stick to the tank well. So today I smeared Gorilla Glue down the whole length of the crack. Then I got the bright idea to stick my Shop-Vac in the filler hole and draw a vacuum on the tank in hopes to suck the glue into the crack. I know, Shop-Vac and gasoline doesn’t sound too safe but the tank was clean and dry. This actually worked out pretty well because when I vacuumed the tank it collapsed a bit and really opened up the crack so I was able to add more glue inside the crack.
It looks pretty ugly but, hey, if it works who cares. It’s not visible when installed anyway. After doing a little more research I wish I had used Seal-All instead of Gorilla Glue. Seal-All is more for sealing where as Gorilla Glue is for gluing parts together. Seal-All says it is impervious to gasoline and is good for sealing gas tanks. I have used Seal-All for plumbing leaks and it worked well. Well if the Gorilla Glue starts to leak I will give Seal-All a try next time. If that don’t do it I will get out my soldering iron and try my luck at plastic welding.