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Restoration & Repair Tips Board

how to remove a dent in a gas tank

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john

01-27-2004 11:26:14




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Anyone have thoughts they would like to share on removing a dent from a gas tank? Can't stick a bar through the filler neck as the dent is on the same side as the neck. Dont guess it would be out of the question to drill a hole and pull the dent then weld it back up. Rather not drill and weld if there is a better way.

John




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mj

02-06-2004 11:43:00




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 Re: how to remove a dent in a gas tank in reply to john, 01-27-2004 11:26:14  
You can pop a dent with the right size firecracker like "Dixie Boy, Black Cat, etc." after it's been de-fumed as per the following: fill it with water and stick a torch to the filler hole, pour off a bit of water and repeat the torch....do this until the water is all out...If you are going to weld on it keep lighting off the fill hole as you weld to prevent any fume buildup. As an aside there was a bulk-truck tank outfit in central Illinois years ago that would arc weld cracks in tanks by having the tanks full and lighting the filler holes. They would let them burn until the welding was done then shut the lids on the compartments to put out the fire. I have arc welded diesel tank cracks with the tanks full (just don't burn through if you are laying under the tank!) but sure as HECK wouldn't try this with gas!

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Greg

02-26-2004 18:50:53




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 Re: Re: how to remove a dent in a gas tank in reply to mj, 02-06-2004 11:43:00  
You did not say how big dent is. Have a friend in a body shop and he has a set of dent pulling suction cups pulls all sizes of dents with them look good when done.



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Johnski

01-30-2004 17:08:00




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 Re: how to remove a dent in a gas tank in reply to john, 01-27-2004 11:26:14  
John First get yourself a box of 5/16" unplated washers from the hardware store. Wash the oil off of some and MIG weld a couple on edge to the dent, then use a regular slide hammer to pull the dent. If you only tack weld one side you can usually snap them off with a pliers and grind smooth without the need to drill into tank. If you even think there might be fumes in the tank then get some dry ice and put it in the tank before welding.
P.S. Don't try the water and freezer trick because water expands equally in all directions when it freezes. You are just as likely to blow out a seam or solder joint as to pop a dent.HTH

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jason

01-29-2004 16:19:59




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 Re: how to remove a dent in a gas tank in reply to john, 01-27-2004 11:26:14  
solder a penny to a steel rod. solder the penny and steel rod to dent. use vise grips and board to pull the dent.



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PASBON

01-29-2004 12:40:01




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 Re: how to remove a dent in a gas tank in reply to john, 01-27-2004 11:26:14  
I have heard of people filling them with water and putting in the freezer.makes enough force to crack a block should make enough to push out a dent.



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CNKS

01-29-2004 08:25:43




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 Re: how to remove a dent in a gas tank in reply to john, 01-27-2004 11:26:14  
I don't have a torch, and have only repaired small dents -- I use JB weld instead of body filler. If the dent is deep, be sure there are no fumes, drill a small hole, pull the dent out with a slide hammer, cover the hole and remaining dent with JB weld, smooth with body filler and spot putty. You might solder the hole shut first.



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John

01-28-2004 06:56:35




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 Re: how to remove a dent in a gas tank in reply to john, 01-27-2004 11:26:14  
Thanks Rusty,
I needed a good laugh this morning. I have welded many diesel tanks, some with fuel in them. People do get nervous for some reason! I had thought about welding a bolt to the low spot, putting a bar across the dent and running a nut down till the dent came out. It is always hard to decide if the tank is really safe when it is gas. Assuming you dont poke a hole with the welder and tack it in spots instead of just burning around it should be ok anyway. But always the chance of problems. I will probably soap it up good, steam it out, and fill it with water. If you don't see anymore of my posts, then you will know things didnt go to well! LOL!

John

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old

01-27-2004 12:53:02




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 Re: how to remove a dent in a gas tank in reply to john, 01-27-2004 11:26:14  
You might try sealing the filler hole and then putting air peassure in it till the dent pops out, but if you do it that way be careful how much air you put it because it could also blow up in your face. I've do that before on tanks but I also put a blanket over it so if it did blow I wouldn't get hurt to badly.



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Rusty Jones

01-27-2004 16:05:29




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 Re: Re: how to remove a dent in a gas tank in reply to old, 01-27-2004 12:53:02  
Back when autos were repaired with body lead, we'd wash out the tank, grind a spot clean, then take a large soldering iron- heated with the torch, tin the clean spot, with regular acid-core solder, reheat the iron, then solder on a stick of body lead! After it cooled, we'd make a loop in the stick, clamp it with vise-grips, and use a bar thru the loop, and onto a block of wood, to pull up on the dent! After we got it out as far as possible, we'd lead in the dent, file it smooth, sand it, prime, and paint it! I suppose if ya filled most of the tank with water,or had it steamed, just leave it 1 inch below the metal that you wanted to solder on. Maybe lay some heavy blankets where the dent isn't! We'd get the tank cleaned out by steam cleaning, then use a torch instead of the soldering iron. I welded motor cycle tanks by emptying out the gas, blowing them out with air, then i'd lay the tank down, put my left foot on it, light the torch, adjust it, then stick the lit torch into the hole!! The remaining fuel would just burn out-(Whooosh!)then i could go ahead and weld the tank! Usually, if the owner was waiting, he'd run away when i lit the torch, expecting to have to drag me down off the garage roof! RJ

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