Repairing diesel fuel tanks

Tom/Barb wrote:
Our Newmars fuel tank has a 1/2" long crack in the bottom of the tank. It drips about 1 drop in 2 minutes. Yes it is full of fuel.
To drop the tank requires a pit, or jacking the coach very high. requires 36" clearance under the coach, we have done that once, didn't like it.

How would you repair the tank? the tank is aluminum, welding is an option, but requires the tank to be removed and purged. I've welded diesel fuel tanks before but I time they will crack again beside the weld.

I now have an EPOXY patch on it, to stop the drip. but don't trust it to stay. ( the tank flexes that is what caused the crack)

Anyway Ideas ?

I once had a pin hole leak in a truck's gasoline tank.
Ran it close to dry, then tilted the truck, sanded the metal and applied epoxy.
It was that way when the company sold the truck, some years later.
Maybe if you did something similar and since it is a crack, clean, sand and apply the epoxy, then a strip of paper thin alum. and re-coat it with epoxy, once again.