I don't know of any thing for doing it yourself. However, there is a sealent used in aircraft fuel tanks that might be usable for doing this. I don't know what it is called or where to get it but a fiend is building a homebuilt plane and used it in his tanks. Try calling a maintance facility at a smaller civil airport. They may be able to point you to it. Another approch is a product called, I think, "Renue", or soething like that. You have to take the tank to one of their dealers to have it done.
What about getting another tank from a wreaking yard?
Well i pulled the thing today and its really bad. A 8 inch crack right below the fill spout. I'm pretty sure its time to replace. My only problem now is that this is the second junk yard tank. I don't want to put another one in that is just going to go bad like the last two. Does anyone make repo tanks? My other option is fuel cell. I don't use the bed anyway so i could mount it there. Anyone tried this? Pros/Cons?
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