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Gas Tank collapse

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Old Jun 13, 2025 | 03:46 PM
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Gas Tank collapse

Hello everyone, today I noticed that my gas tank on my '77 F250 had shrunk, causing a small crack. Repairing the crack isn't a problem, but I'm not entirely sure how this could have happened since I installed a vented gas cap. Are there any problems with these gas caps that cause them to malfunction from time to time? Thanks very much, Greetings Tobias.
 
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Old Jun 13, 2025 | 06:06 PM
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I doubt a fuel pump can pull hard enough to collapse a steel fuel tank and crack it. You sure it wasn't hit?
 
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Old Jun 13, 2025 | 06:37 PM
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Yea, Tbear X2 on what he said//

Prolly all rusted thru from the inside. Then vibration took over and crack apeared....
My guess..
Alex
 
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Old Jun 13, 2025 | 10:40 PM
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The tank looks very good on the inside, so there's no rust. I can't say when this happened... Should I repair the tank or replace it? I don't want it to happen again. What do you think?
 
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Old Jun 13, 2025 | 11:04 PM
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Well, all I can tell you is what I did to my 79 F250.
I replaced my tank as I was rebuilding my truck. Even though the tank appeared to be in decent shape.
Gas tanks are a very importanrt part of these trucks, and safety has always been one of my pet peeves.
Brakes,,, steering,,,, and fuel,,,, and tires are always the most important part of a build or rebuild..

My .02 worth
 
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Old Jun 13, 2025 | 11:19 PM
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What ever caused it, if deformed and cracked, I'd replace it.
 
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Old Jun 13, 2025 | 11:49 PM
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Yes, that's what I think too. Then I'll replace the tank.
Thank you.
 
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