Gas and diesel are two different cats. Gas vapors explode quite readily with the correct oxygen/gas mixture whereas diesel is much less likely to explode. If you are switching fuels then you may need all new fuel
lines and bilge
blowers. Believe me, you do not want to have a gas leak into the bilge
of your boat. I have seen what happens when the bilge blower was not used after refueling at the fuel dock
. It was not pretty. It is worth spending the money
to have a knowledgeable consultant check out your installation
If something says "diesel fuel only" do not use it for gasoline...