Its not that simple as i have not seen how the CG feels about it from a safety standpoint
Actually, evaporation emissions controls have the potential to enhance safety, reducing emissions during fueling operations. It could be (not easily) combined with vapor recovery filling. When I was a kid, learning to drive a car, you refueled in a cloud of vapors, since nothing was recovered. Much vapor recovery in refineries is practiced because of fire safety requirements as much as emission requirements (working in a cloud of vapor is just a bit scary).
Any system that controls tank breathing will reduce evaporative loss from the tank, reduce fuel oxidation, and tend to decrease carb problems. Sounds OK to me, if well thought out.
Certainly a system can be designed badly; some already are. The EPA has mentioned a few potential problems and is working with the AYBC to develop installation standards
So, not all gloom and doom.
But yes, there was discussion of safety in 06':
"What are the technical report’s general conclusions?
For each new standard, we conclude that the anticipated emission standards may be implemented without any incremental increase in risk of fire or burn to consumers. The testing and analysis further indicates that compliance with the anticipated emissions standards could somewhat reduce the risk to consumers using products in these subcategories.
We are also considering diurnal emissions standards for fuel tanks used on Marine SI vessels. For personal watercraft and portable outboard fuel tanks, this would likely involve the use of fuel tank venting that is already commonly used. For vessels with installed fuel tanks, this would likely involve the use of activated carbon canisters to capture vented fuel vapors. Such canisters have been used safely on automobiles for more than 30 years and a prototype fleet run by industry last summer on marine vessels revealed no safety concerns.
Overall, there should be no increase in risk of fire or burn to consumers in applying advanced technology to reduce evaporative emissions from these marine engines and vessels. In fact, the reduction of permeation emissions is likely to decrease safety risks from fire in the under-floor areas on boats where the tanks and hoses are installed."