Leaks -- yes, but it's much easier to maintain in regularly professionally maintained commercial-only bulk equipment, than in personal cars and garages. Embrit

Leaks -- yes, but it's much easier to maintain in regularly professionally maintained commercial-only bulk equipment, than in personal cars and garages. Embrittlement is a known problem, and pretty much any alloy of steel helps against it. Various coatings are used as well (e.g. organic compounds). It's a well-researched area, so it's possible to estimate and engineer around it. Re. ultra-pure source gasses, I don't know, maybe, but I don't see any difference with gasoline or Jet-A fuels. Airports aren't ultra-clean environments either.