Originally Posted by GordMay
SAE & ISO
The U.S. Coast Guard addresses fuel line requirements in the code of federal regulations
(CFR) that applies to recreational boats: CFR Title 33, Type A1-15.
Ratings & approvals are primarily determined on two factors, permeability and fire resistance.
Particularly with volatile gasoline, permeability is a concern due to vapor build up. If it is in an enclosed space "below deck" (Type A) it must not give off explosive vapors. Manufacturers often refer to hose as "above deck"/"topside" (B) or "below deck" (A) hose, which is simply a way of phrasing the permeability rating.
SAE J1527 & ISO Type A1 are a couple fuel line of Standards
The North American rating system for marine
hose is known as SAE J1527 and it provides for grades as follows:
-fuel feed hose; has a fire resistant cover; is designed to have fuel in the hose at all times. Least permeable with highest fire resistance.
-fuel vent hose; has a fire resistant cover; is not designed to have fuel in the hose at all times.
-fuel feed hose; without fire resistant cover; is designed to have fuel in the hose at all times; intended for non-enclosed spaces. Diesel
engines or above deck
outboard gasoline applications.
-fuel vent hose; without fire resistant cover; is not designed to have fuel in the hose at all times. Diesel
This section is for gasoline systems.
§ 183.501 Applicability.
(a) This subpart applies to all boats
that have gasoline engines, except outboard engines, for electrical
generation, mechanical power, or propulsion
I am not aware of a USCG section that applies to recreational boats with diesel engines. Please post.