uh ohhhh

Sterling said

The threads stripped out of the drain plug on my Hamburger oil pan in my 70 Dart race car. I drained the oil out all week, and decided to weld a 1/2-20 nut. I just finished welding, when I guess was a combination of race oil and fuel fumes blew out the drain hole with a bang and coated my welding helmet. Couldn't see out of it , and could not get from under the car fast enough. It did work, but I would not suggest welding in the car

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A safe way to pull fumes out thru breathers would work. But vacuum motor might set it off, too. Any evacuation might've helped.
Hopefully no other leaks now.
I no longer remove drain plugs, when I can almost always suck oil out with my Boat Oil Change Pump. You push tube down into dipstick tube until it hits bottom and turn pump on. Then twist hose to get in lowest spot. When oil stops flowing twist again to be sure you got it all.
Some imports, you can remove oil filter & put hose into oilpan thru drain back return hole, a direct shot.