I've welded quite a few gas tanks. I just drain the gas out and let it sit open for three or four days and wait for the fumes to vacate. Sometimes if there is too much fumes I will run some compressed air into it at about 2 psi for a couple of hours before welding. Occasionally the gas will ignite but since the filler cap is off it makes a little noise and shoots a small flame out the neck. Then it doesn't present a problem anymore. The first couple of times I welded a gas tank I put a flaming rag on the end of a 10' stick and ran it past the filler neck to see if it would blow. I soon found out that wasn't necessary.
I've also tried to fill small holes with JB Weld. It won't work unless you use a fuel tank liner like Red-Kote. The gas they make today will eat up JB Weld.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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