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Old 05-10-2024, 04:49 PM
VW cat VW cat is offline
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Default Fuel tank repairable?

I've got a case diesel fuel tank that has some holes and rusted areas. Does anyone recognize this type of construction? It looks like the seams were rolled together with a knurling tool. I'm hoping to braze it. However I came across some type of solder spilled on one spot. Are these tanks soldered?
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  #2  
Old 05-10-2024, 05:57 PM
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Whitetrash Whitetrash is offline
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Clean up everything really good and try this was highly recommended by someone on this site years ago. I'm a "Link Packrat" among other things https://www.aircraftspruce.com/catal...prosealant.php
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Old 05-12-2024, 05:26 AM
VW cat VW cat is offline
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An old expression, "that's the cat's meow". I'm ordering that today, and thank you for the link. I've got a small sandblaster to get the surface rust free. Quite sure there is solder in those joints.
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Old 05-12-2024, 01:30 PM
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Shade Tree Welder Shade Tree Welder is offline
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1. They were electric resistance welded, no solder from the factory.

2. I would braze them as they rusted from the inside, based on where the holes are.

3. After brazing use a fuel tank sealer system...

https://por15.com/collections/all/pr...el-tank-sealer
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Old 05-12-2024, 01:51 PM
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Those tiny serrations along the lips suggest that the tank may have crimped and soldered joints. Or, as Shade says, they may be resistance welded; I've seen them done either way.

In some of those spots where there are larger holes it might be easier to solder small patch panels in place. If you do, and if you think the tank is soldered, be sure you don't de-solder the seams.

Definitely clean the tank well and make sure it is PROPERLY de-fumed. Filling a tank with water or running exhaust fumes in it are not always effective ways of de-fuming a tank. Don't ask me how I know.

Definitely use a good sealer on the inside of the tank after all repairs are done. Even then, it's a good idea to run extra filtration in your fuel lines. A few tiny bits of rust in your fuel system can ruin your whole day...
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Old 05-13-2024, 02:49 PM
VW cat VW cat is offline
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I've held off ordering the product from aircraft spruce, because my tank has to sit on that rubber tank coating, on each side. The tank is thin there(see pic). I'm thinking of using the POR-15 product to do the inside, then use devcon on the outside to cover all the pitted areas. What do you think?
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