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Pin holes in VAC gas tank

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Dave

12-03-2002 10:17:21




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Any thoughts to help me out? I have tried some products from my local auto parts store that I applied to the outside of the tank but they have failed after a few months. I have heard about a tank sealer, but I don't know how that works or who I see to have that done. Any advice would be of value. Thanks in advance!




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Jeff

12-03-2002 20:19:13




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 Re: Pin holes in VAC gas tank in reply to Dave, 12-03-2002 10:17:21  
if you live near a good motorcycle shop they should be able to get you a tnk repair kit as well. Might be a little high but you never know.

We did a tank on a bulldozer a few yers ago and it was pretty easy. clean the inside real good and put the stuff in there and move it around until the tank is completly coated. I have used fiberglass on a Jeep gas tank one time as well.



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mj

12-03-2002 18:40:24




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 Re: Pin holes in VAC gas tank in reply to Dave, 12-03-2002 10:17:21  
If you are plugging pinholes you'll need to clean the area around each one down to clean base metal or the galvanized coating. Then, using a large, heated soldering copper and tinners' flux, plug the hole. If the holes are large enough so that the solder falls through then lay some pieces of 1/16 brazing rod side by side over the hole and flow solder onto the rods and tank. For bigger repairs sheet brass or galvanized tin will work; cut the patch to size and then solder it around the edges to the tank. If most of the bottom is bad you can patch over it with sheet metal or cut it out and then flange the edges (Eastwood has a flanging tool); then cut and solder in the new bottom. This method keeps the bottom of the tank surface smooth and flat.

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ff316

12-04-2002 10:46:49




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 Re: Re: Pin holes in VAC gas tank in reply to mj, 12-03-2002 18:40:24  
Daggone, you've told 'em how to do it right! Kind of makes me wish my tank leaked so I could try some of that. :) Do you have any advice for welding cracks in sheetmetal? I was planning to drill a hole at the end of the crack to keep it from spreading, flatten down with body hammer, clean good with wire wheel, then skip around with wire welder to keep warping down. Does this sound OK? Thanks! Fireman

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mj

12-04-2002 18:06:13




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 Re: Re: Re: Pin holes in VAC gas tank in reply to ff316, 12-04-2002 10:46:49  
I've had good luck welding cracks as you describe, even without the holes. The main thing, as you say, is to keep the heat input to a minimum and to spread it out over time. Before the days of the plasma arc we used to cut sheet metal with a torch and a garden hose running cold water. One guy worked the torch and the other guy kept the sheet cool with the hose. Had to be careful not get the water into the fire, though!

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ff316

12-04-2002 18:23:52




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 Re: Re: Re: Re: Pin holes in VAC gas tank in reply to mj, 12-04-2002 18:06:13  
Thanks mj, hope to get started on that project before long.

Have a good one, Fireman



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Mike Schotte

12-03-2002 17:59:33




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 Re: Pin holes in VAC gas tank in reply to Dave, 12-03-2002 10:17:21  
I've got an extra SC gas tank that I've been wondering how to repair as well.

The tank metal is very solid, except for an area about 4 inches long down by the sediment bowl (the low side of the tank on the side that had the missing tire all those years.)

After I remove the rusty metal with a drill, I'll probably have about 6 or 8 holes- ranging in size from 1/8" to 1/4". Other than that- the rest of the tank is very solid, and I hate to scrap it if there's a way to re-build it.

I know all about the tank liner products... but I have been wondering how I'm going to plug or span these holes. I'm thinking that brazing won't be very easy on the bigger sized holes.

-Schotte

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Robert Nicholson

12-04-2002 12:04:40




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 Re: Re: Pin holes in VAC gas tank in reply to Mike Schotte, 12-03-2002 17:59:33  
Schotte:

After the tank is clean, and I mean clean from gas fumes, I have found that a mig welder does an excellent job on small holes. It is much easier than brazing which will also work. The nice thing about the mig weld is that you can surface it after it is repaired.

Bob



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ff316

12-03-2002 12:17:40




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 Re: Pin holes in VAC gas tank in reply to Dave, 12-03-2002 10:17:21  
You need a catalog from the Eastwood Company. They sell all kinds of products for auto restorers, and I hear they have a good tank sealant. I have never tried it personally. They most likely have a web page, I would do a search for "Eastwood" on your favorite search engine, something is sure to come up. If they didn't sell quality products they would surely be out of business by now. Good luck, Fireman

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Paulf

12-03-2002 12:39:40




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 Re: Re: Pin holes in VAC gas tank in reply to ff316, 12-03-2002 12:17:40  
The URL is www.eastwoodcompany.com
I used their gas tank sealer ( 10165Z ) about $40
You have to get your own Acetone and muriatic Acid. It is a bit of a process but I did teh tank on my M-37 about 5 years ago and it is still fine. (I patched one biger pin hole with a sheet metal screw and some epoxy befor coating.
There is also a company Gas Tank Renu that does great (if somewhat expensive work) especially if you have serious rust through issues
Paul f

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Slowpoke

12-05-2002 22:15:36




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 Re: Re: Re: Pin holes in VAC gas tank in reply to Paulf, 12-03-2002 12:39:40  
I have a'64 Rambler American. About '87, after letting it sit for 4-5 years, I put it back on the road. Came out of work one day, and found gas all over the ground; must have had 6-8 small leaks. After driving home!!!, removed tank and cleaned thoroughly. I soldered all the holes; it's still holding today, even after sitting another 5 years. I'll probably l have to do it again.



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