jb weld works well as others have said,, but there are 3 rules... it must be clean, it must be clean and it must be clean.
sand it, clean it with alcohol,let it dry, then apply the jb weld. This means you must drain the tank to keep it clean, and it will work very well.
or buy some tank sealers like por 15 or red coat, and do it from the inside and reseal the entire tank. These work very well but you must also follow instructions and get the tank clean, clean and clean. I have restored old tanks that looked like swiss cheese and used painters tape on the bottom to temp seal all the holes till the por 15 dried.
I have used ivory soap a couple of times in emergencies with great success on gasoline tanks, I dont know if it works on diesel tanks. One time I cut a stub out of a soap bar and plugged a 1/4 inch hole on a tank bottom, and it held for over a month till I could pull the tank.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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