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Old 02-08-2012, 12:42 PM
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Gas tank continually rusting out?

I am working on a 69 corvette. This is the third time the gas tank required replacing because it has rusted out in the bottom. The car is driven at least once a week. The original tank lasted 32 years. It was replaced with an after market tank that lasted about 10 years. We have a new tank ordered now to go in next week.

Anyone have any ideas how to prevent the rust thru from happening in the future?

Would a gas additive work to prevent the rust?

I have read good and bad reviews about interior gas tank coatings. Has anyone used these with success?

Thanks for any experience you have had with this. We have older cars with the original tank still working fine with no problems.

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Old 02-08-2012, 04:26 PM
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Rusting gas tanks

Quote:
Originally Posted by HotRodMan
I am working on a 69 corvette. This is the third time the gas tank required replacing because it has rusted out in the bottom. The car is driven at least once a week. The original tank lasted 32 years. It was replaced with an after market tank that lasted about 10 years. We have a new tank ordered now to go in next week.

Anyone have any ideas how to prevent the rust thru from happening in the future?

Would a gas additive work to prevent the rust?

I have read good and bad reviews about interior gas tank coatings. Has anyone used these with success?

Thanks for any experience you have had with this. We have older cars with the original tank still working fine with no problems.
What makes you think your tanks are rusting from the inside. You more than likely are getting cheap tanks from China that has bad metal in them. Metal will also draw moisture out of the cement if you are parked on cement and it is getting wet. Are your straps that hold the tank rusting out also, or just the tank, if they are not then I would get my tank from somewhere else.

Bob
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Old 02-08-2012, 04:34 PM
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Tend to agree with Bob......I have had tanks last less than 5 years. Of course, the climate here is a bit harsher......Are you painting the outside of the tank?

I have used the tank coating stuff to repair small engine tanks.....worked well. I forget the name right now
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Old 02-08-2012, 07:46 PM
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Make sure you have proper grounding to the tank from the main engine ground, drain all fuel during winter storage. I agree poor quality sheetmetal is a likely contributing cause, they don't build them like they used too.
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Old 02-08-2012, 08:27 PM
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Quote:
Originally Posted by poncho62
Tend to agree with Bob......I have had tanks last less than 5 years. Of course, the climate here is a bit harsher......Are you painting the outside of the tank?

I have used the tank coating stuff to repair small engine tanks.....worked well. I forget the name right now
Yes poncho is right tank coating works fine on big tanks too but you get what you pay for so get the good stuff! You can also have it professionally done there are shops that specialize in it! Never heard of vette tanks rusting from the inside out though.

Jester
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Old 02-08-2012, 09:44 PM
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Rusted gas tank

Thanks for all the responses. Here are the answers to your questions.

I'm absolutely sure the tank is rusting from the inside because I can see rust in the extreme bottom of the tank on the inside only. I did not paint the outside of the tank but there is no rust on the tank or the straps on the outside at all. The tank looks like a brand new one. The only ground it has is the one near the sending unit. The car is never stored, it is driven year round. As far as availability goes, the best I can tell, it is exactly the same tank from all sources, because it looks the same and sells for the same price regardless where you buy it. I looked for a poly tank but could not find one anywhere for that car. The car is parked on concrete, but there is a vapor barrier under the concrete and there is an enclosed garage over the concrete.
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Old 02-09-2012, 01:41 AM
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rusting gas tank

Quote:
Originally Posted by HotRodMan
Thanks for all the responses. Here are the answers to your questions.

I'm absolutely sure the tank is rusting from the inside because I can see rust in the extreme bottom of the tank on the inside only. I did not paint the outside of the tank but there is no rust on the tank or the straps on the outside at all. The tank looks like a brand new one. The only ground it has is the one near the sending unit. The car is never stored, it is driven year round. As far as availability goes, the best I can tell, it is exactly the same tank from all sources, because it looks the same and sells for the same price regardless where you buy it. I looked for a poly tank but could not find one anywhere for that car. The car is parked on concrete, but there is a vapor barrier under the concrete and there is an enclosed garage over the concrete.
I'm betting bad metal, you can coat it until the cows come home and it will still rust.

Overseas when they melt steel down they melt everything together, which makes for bad sheet metal or bars or whatever. We would never take steel bars from overseas, just no good.

Bob
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Old 02-11-2012, 02:30 PM
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Replacement tanks are still available from GM.. At least they were 5 years ago...Check a delaer that deals in Gm Restoration Parts. I replaced mine in 1995...No problems...
Reid '72 T-top
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Old 02-11-2012, 05:28 PM
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The added Alcohol in our Fuel doesn't help either, it attracts & absorbs water.
I think coating a new Tank would be a good idea, if as you say it's rusting in the lowest area where water will collect.
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Old 02-11-2012, 11:17 PM
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Received the new tank today

I had already ordered a new tank from one of the major corvette supply houses. When I received it, there were GM numbers on the box and stamped on the tank itself. The old tank and the new tank both weigh exactly the same weight, 16.5 pounds but the GM tank had some type of zinc coating on the metal that the other tank did not have. It was just plain steel with no coating, so I think this new GM tank will last longer. Oddly enough, the new tank was about the same price as the one purchased 10 years ago.
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Old 02-12-2012, 12:26 AM
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The last tank I did was 5 years ago in a frind of mine's 71. The tank from the sealer was less than the aftermarket catalogs. You shouldn't have anymore preoblems with a GM tank..
Reid
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Old 02-12-2012, 10:20 AM
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Rusting gastank

Quote:
Originally Posted by vncruiser
The last tank I did was 5 years ago in a frind of mine's 71. The tank from the sealer was less than the aftermarket catalogs. You shouldn't have anymore preoblems with a GM tank..
Reid
Well sounds like you might have found the answer. You will have to let us know in 10/15 years.

Bob
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Old 02-12-2012, 10:40 AM
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Quote:
Originally Posted by 35terraplane
Well sounds like you might have found the answer. You will have to let us know in 10/15 years.

Bob
Did mine in 1995..Car sits alot...No problems..

Reid '72 T-top
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