I have to do some welding on my fuel tank. I ran exhaust in it for about 1 ½ hours. It does not smell of gasoline now but this new stuff does not smell as strong as old gas did. So I am wondering if anyone has an idea to test it for safe to weld on without destroying the tank?
I Googled it for you, https://www.google.com/search?client=firefox-b-1-d&q=how+to+weld+a+used+gas+tank?
I've heard putting some DRY ICE inside the tank , which is really frozen CO2 fills the tank with inert vapors . As soon as it hits air temp it goes directly to a Gas .
I tossed a match in the open hole with the sender out . it went WHOOSH and went out. Welded away then reinstalled it.
HAHA!! I've gone so far as to fill them near the top with water and light a match...... burns, but no explosion. Striking the first arc is the nail biter!!! LOL
I have welded sumps onto used gas tanks in the past.. just drain all the fuel and then stick the hose in it out in the driveway.. flush it with water for 10-15 minutes, drain, and you will be fine. JW
I took my tank that I had a sump welded in to, to a radiator shop. $40 bucks and no hassles at all. I have read that putting the exhaust into the tank makes it even more flamable,but watched my dad perform it a few times.. I apparently didn't get his balls...
I've done a few,..no problems just let it sit for a day after I prepped it,..you can also fill it with a heavy gas,..that will displace the fumes Next question how do you plan to cut the tank for the sump??,.. reason I ask is if you plan to just put a large hole you're going to have slosh issues. Drill large holes to feed the sump then weld a baffle over the pickup,. Extend it to the back of the sump with a 1in slot in the back and drill the baffle with 3/8 holes