Why can't a boat have a fuel return line?

Question

aparently it's illegal. why?

Answer 1

Diesels do have a return line,  I imagine it is to prevent pumping gasoline into bilge if a leak occurs in the return.  It is not needed anyway.

Answer 2

Its not illegal>Most Fuel injection have return lines>Gas an diesel>

Answer 3

Gasoline engines do not have a return line. In diesels 75 to 80 % of the fuel is returned to the tank and it is used to cool and lubricate the injectors and fuel pump. So all diesel boats have a return line.

Answer 4

i would say it is an emmisions issue where boats are exempt