suppose a puncture hole were to inadvertently appear in the bottom of
my gas tank? What would be some good ways to plug the hole ?

I'm thinking a fine thread stainless steel flat head screw that was screwed
into a tapped hole with special glue/sealant and a washer would probably
work.

You're probably catching on now..... A non electric drill would probably
be best to drill into the bottom of a full gas tank but all I have presently are battery powered and 100volt drills.

 

I would drain the tank so no dripping.. sand the tank with rough sandpaper about 3 inches in diameter.. GEt it clean, but plenty of scratches to roughen it up....... Mix up an ounce of JB weld and smear it on the area as a patch. Rub it into the scratches with your finger to get good contact. spread it around with a small putty knife so it is 3 inches in diameter, feathered out thin on the edge and little over 1/8 inch thick over the hole area.

 

if you cant drain the tank, sometimes you can use a very small sheetmetal screw and get it in half way. smear RTV over the exposed threads and screw it in snug.. wipe off excess RTV..... or you can use a tin roofing screw with the rubber washer ........if that stops the drip, then do the JB weld patch over the top of the screw.

 

Get something like this.

That said I would find a better way to drain the tank than drilling a hole in it.

 

That's the best idea by far!

 

Now that you have a pretty nice hole drilled there, wouldn't a drain petcock be kind of handy sometimes? "Just thinkin' out loud."

 

Yes, for anyone to steal your gas.

 

Well I spose. But, if they really want it, they can simply cut the hose too, that's on thousands of trucks just below the in cab tank. See where I'm goin' with that?

 

WOW, I would not even think twice......JUST REPLACE the tank, their cheap. This is fuel we're talking about here, people get blown up because of those things.

 

When "someone" put a hole in my tank, I ended up taking the tank off empty all the gas and let it all evaporate then I flushed the tank with water and welded the hole shut. The hole was the size of a dime. (punch hole).