Red is for gas tanks
And by the way – take your old metal tanks out and use only new Poly tanks. Save yourself a lot of trouble.
Yellow is for Diesel
Blue is for your water
Do not ever mix. You have to know while looking at the tank in the dark, may be in a storm, your life could depend on it!
Don’t just purchase any cheap can at a garage sale or any store, or use someting old you have had laying around.
Use your old cans for the lawnmower, never for your boat or outboard.