CASR 92.175 Goods carried by private operators
Subparts 92.B and 92.C do not apply to the carriage of dangerous
goods by an aircraft operated by an operator engaged in private (noncommercial)
operations if:
(a) the aircraft is operating in Australian territory and:
(i) is unpressurised; and
(ii) has an approved passenger seat configuration of less than
10 seats; and
(b) the goods:
(i) are in a proper condition for carriage by air; and
(ii) are identified by class in accordance with the Technical
Instructions; and
(iii) are permitted by the Technical Instructions to be carried on
a passenger or cargo aircraft; and
(iv) are stowed and secured on the aircraft to prevent
movement and damage, and segregated in accordance with
the requirements of the Technical Instructions if they are
likely to react dangerously with one another; and
(c) the pilot-in-command of the aircraft ensures that every person on
board the aircraft knows, before boarding the aircraft, that the
dangerous goods are on board.
Sorry about the formatting. Full regs
here
And for those trying to suggest that an empty leg out to pick up pax is technically a PVT operation, remember that the now empty Jerry Can is a DG that you will need approval to carry and need to manifest on the way home with pax.....