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Yes, I found that publication after posting. “United States Coast Guard and Environmental Protection Agency
Compliance Guideline How to Comply with the Law-Fuel and Emissions
© 2011 American Boat & Yacht Council, Inc., 2011.
It’s quite comprehensive. Not all applies to outboards.
Aluminum fuel lines are prohibited: (Not sure of the reasons.)
“If metal is used for any portion of the fuel line (except for fittings) from the tank connection to the engine connection (usually at the fuel pump), the metallic fuel line portions must be seamless, annealed:
(1) Copper;
(2) Nickel copper (Monel); or
(3) Copper-nickel.
No other metals are permitted.
Also, the thickness of the tubing wall must be at least 0.029 inches unless the fuel line portion is a corrugated or accordion type of flexible fuel line. Tubing is available with thinner wall thicknesses, but they SHALL NOT be used.”
Expect I will use the A1 hose, as I can snake it trough the bilge. To do a good job with metal line would have to take up the flooring and clamp at every frame….