Many many boats run entirely on petrol. Also, many many (almost all?) boats use butane or propane. Should we all stop using these things?
From the BSS website:
These are the core points that should never be forgotten.
Never install a portable generator permanently or make unauthorised modifications that are not supported by the manufacturer, or proprietary component supplier.
Never run generators on the boat, or on the bank near to doors, vents, windows and hatches. If you can smell exhaust fumes in the boat, it could mean the cabin is also filling with deadly carbon monoxide.
Never refuel any generator anywhere aboard the boat; take it to the bank and ensure you are a safe distance from other boats and potential sources of ignition.
Nothing particularly onerous.