Refilling reminds me of an incident a number of years a go.
In the mid 80's I was working in Oman (wilding all over the place each weekend)
Fuel at remote location was taken in barrels and decanted into jerry cans via a tap at the bottom.
As the level in the barrel went down, so the flow reduced, taking an age to fill the jerry can.
One of the brits, inserted a Schraeder valve into the cap of the barrel. An airline provided a few PSI to assist in the draining of the barrel.
Unfortunately a couple of the locals saw this and copied, but to get the fuel out quicker, kept the airline on full.
An almighty bang, flash and one had their head completely severed by the top of the drum, the other two engulfed in flames sadly deceased.
On investigation, "No one" knew anything about pressurising barrels etc!!
Moral, IF you understand what you are doing, you can use suitable methods to move a flamable liquid from one place to another, but let someone who doesn't know or even THINK they know can be very dangerous, if not fatal.