My engines are getting old, and before I have a problem, I want to replace the fuel lines. The 1/4" line is no longer available from BRP. I've found Briggs and Stratton 1/4 " fuel line, but it probably isn't marine use rated. What do I need, and where can I buy it? Also what is the best fuel line to use in the larger diameters 5/16" in the engine compartment and 3/8" supply lines.