Holy? Shoot, I've been doing it wrong!
I used to crew on a 50' displacement trawler in the Galapagos Islands. We filled her tanks by siphoning from rusty 55 gallon barrels of diesel that came out from the mainland on barges.
When the seas got up, that's when the rusty diesel would get all stirred up...and the filters would clog. We'd draw straws and the short straw had to go down into "el infierno" ("HELL") to change the filters.
Boys and girls, there is NOTHING like changing clogged diesel filters in a cramped engine space (hardly a "room") with a hot Caterpillar diesel engine filling 90% of the space and the round-bottom hull rolling sickeningly on her beam ends.
There was absolutely NOTHING holy about that experience other than the fact that the poor slob who crawled out of that hot, stinking hole was so sick that he wanted to die!