Suggest using this as a guide:
https://www.boatsafetyscheme.org/med...de%20chap7.pdf
LPG /
Propane / Camping Gas is probably the most dangerous thing on the vessel. Whilst an outdoor
installation seems 'obviously safe', it may not be unless care is taken.
On review, I think i'm going with a bottle mounted on the stern somewhere, with its own regulator, positioned to drain
overboard in event of a leak. One point, Do check the
engine air intakes are NOWHERE near the where the propane/LPG would flow if it leaked.
Regards