I just have a question.if a gas tank bought from a junkyard with a hole in it,can a piece of sheetmetal be welded to it to seal the hole

Keep filling it half way. Cost to fix it would be around $400+. tank has a hole, seal on sending unit is bad. Plus hoses. Cost i still around $400 +.

quick temp. fix would be jb weld for small holes i had a enduro motorcycle that had a broken pit **** at the bottom of tank and jb weld worked for me

get a tube of J.B. Weld, drain the tank, give it a couple hours for the hole to dry, apply enough J.B. Weld to cover the hole. (you have to be very quick with the J.B. Weld or else itset up before you can get it where you need it. dries in 3-5 mins.)

Repairing a fuel tank can be dangerous so don't try to do it yourself. Any attempt to weld the tank will result in an explosion, even if the tank is completely empty; you can't get rid of the explosive fumes.
You'll be better off replacing the tank if there is a hole in it.

If the frame is rusted you can weld in pieces up plate metal to fix it. If you don't weld or can't get welding done you might be able to bolt a peace a piece of metal. But welding is preferred. You could also go to junk yard and get a different frame or cut out a piece of frame from a junkyard truck. Good luck.

I had this problem also. Although I took mine off and used a sealent on the inside and used Seal All on the outside. First off I cleaned mine and primed and repainted it. You may be able to get away with loosing the bracket, find where the gas is coming from and clean that area very well. You can buy a something called metal weld-looks like a crayon. You break a chunk off and knead it and smash onto the hold or area like putting silly putty on it. Then after that is dry or hardened, take some "Seal All", comes in a yellow/red tube and smear that all over the weld patch. Let it dry and cure and replace the bracket. If your rubber is moving you need to tighten the bracket up. Hope this helps.

try a can of "ALUMASEAL" BRAND STOP LEAK, if that doesn't seal it you will need a repair

Mig will be fine.

Some tanks have a fitting(s) molded into the tank, and filler attaches with a short piece of hose & clamps, others have a seal that filler pipe slides into for a tight fit. If it's the seal type & you can't pinpoint where leak is, you may have to pull filler out. Usually screws behind gas tank filler door, and out it comes but take a close look for anything else that may be holding it. You may have to twist & wiggle a bit but it should come. Inspect seal & tubes for nicks etc. If you have to re-use old seal, clean good, lube it & lube filler pipe before inserting back in to eliminate more nicks, and helps go in easier.Twist slightly going in too, makes it easier & helps reduce seal damage.

just drop it less than $100