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My gas tank filler neck at the bottom is leaking. Small hole about the size of pencil point around the weld. How do I fix this? All gas out of tank.

If that is the only place it is leaking and the filler neck is well secured otherwise, I would use a JB Weld product to seal the actual leak and then add an inch or so margin around the leak area as an additional fudge factor. Clean the application area well before applying and allow the epoxy to fully cure a few days before adding fuel.

The question becomes why just that small area has chosen to leak.. Is there some kind of stress or rust that caused the area to fail after all this time and is it still able to advance? If so the JB Weld my not help for long and another leak could appear.

According to the manufacturer, cured JB Weld will not be affected by gasoline. Here is the FAQ link in case you might be interested in some of its properties and specific product recommendations.jbweld.com/pages/faqs

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Belive it or not that can be soldered or sweat soldered with tinners solder. But try the JB Weld first. My favorite is Seal-All. It comes in a red/black and mostly yellow tube. Sold at discount stores and on eBay. Not expensive. No mixxing. I currently haave a motorcycle gas tank wassealed over a year ago and some 2000 miles and it is not leaking yet.