On Sat, 4 Jan 2020 16:00:42 -0700, Bob La Londe
wrote:

On 1/4/2020 3:50 PM, wrote:
I have done this many times.first wash out tank with liwuid gunk degreaser.flush it good with water.but tank on bench.stick airhose in tank low preasure.leave tank sit 5 minutes.leave airhose in while welding.no stangent fumes no explosion.a old mortorcycle mechanic taught me that 50 years ago


I did something similar on MC tanks, but used CO2 because its inert and
heavier than air.
That's how I repaired the oilpan on a '65? Riviera ---