Have not done a boat or any motor for that matter, But gettn interested. We've been looking at the water to Hydrogen systems and other alternatives.
Hydrogen And I believe NG are lighter than Air = Safer for boats as the fumes will rise and not collect in the bilge.
Impacts in boats (Severe head on type) are less frequent than cars/trucks. Safer for the pressurized fuel tank.
Where is there more info on CNG? Galileo kit?