Don't get me into this! :)
For the record lets go directly to the source the regulations!
This is a few sections I pulled for general review. If you would like to review more here is the source for the regulation.
33 CFR 183.501-183.590
If installed properly, USCG A1 fuel line is acceptable from fuel pump to carb. I assume that Jeff installed his correctly.
From what I have been able to sort out, you could use A1 fuel line from the fuel pump to an inline filter then on to the carb. I have not seen this done and most use pipe and I am assuming it is for abrasion protection as well as burn through protection in the case of a leaking carb resulting in a fire on top of the engine. ,
The only glitch is how it is connected. Regulations requires that the metal pip be have a bead or flare or groves. Just pushing the A1 hose over a straight pipe even though double clamped fails to meet USCG construction standards.
Sec. 183.538 Metallic fuel line materials. Each metallic fuel line connecting the fuel tank with the fuel inlet connection on the engine must:
(a) Be made of seamless annealed copper, nickel copper, or copper-nickel; and
(b) Except for corrugated flexible fuel line, have a minimum wall thickness of 0.029 inches.
Subpart J--Fuel Systems
Source: CGD 74-209, 42 FR 5950, Jan. 31, 1977, unless otherwise noted.
General
Fuel system means the entire assembly of the fuel fill, vent, tank, and distribution components, including pumps, valves, strainers, carburetors, and filters. Static floating position means the attitude in which a boat floats in calm water, with each fuel tank filled to its rated capacity, but with no person or item of portable equipment on board.
[CGD 74-209, 42 FR 5950, Jan. 31, 1977, as amended by CGD 85-098, 52 FR 19728, May 27, 1987]
Sec. 183.507 General. Each fuel system component on a boat to which this subpart applies must meet the requirements of this subpart unless the component is part of an outboard engine or is part of portable equipment.
Equipment Standards
[CGD 74-209, 42 FR 5950, Jan. 31, 1977, as amended by CGD 85-098, 52 FR 19728, May 27, 1987]
Sec. 183.530 Spud, pipe, and hose fitting configuration. Except when used for a tank fill line, each spud, pipe, or hose fitting used with hose clamps must have:
(a) A bead;
(b) A flare; or
(c) A series of annular grooves or serations no less than 0.015 inches deep, except a continous helical thread, knurl, or groove.Sec. 183.532 Clips, straps, and hose clamps.
(a) Each clip, strap, and hose clamp must:
(1) Be made from a corrosion resistant material; and
(2) Not cut or abrade the fuel line.
(b) If tested in accordance with the fire test under Sec. 183.590, a hose clamp installed on a fuel line system requiring metallic fuel lines or ``USCG Type A1'' hose must not separate under a one pound tensile force.
[CGD 74-209, 42 FR 5950, Jan. 31, 1977, as amended by CGD 85-098, 52 FR 19728, May 27, 1987]
Sec. 183.534 Fuel filters and strainers. If tested under Sec. 183.590, each fuel filter and strainer, as installed in the boat, must not leak more than five ounces of fuel in 2 ½ minutes inclusive of leaks from the fuel pump and fuel line.
[CGD 77-98, 42 FR 36253, July 14, 1977]
Sec. 183.536 Seals and gaskets in fuel filters and strainers.
(a) [Reserved]
(b) Each gasket and each sealed joint in a fuel filter and strainer must not leak when subjected for 24 hours to a gasoline that has at least a 50 percent aromatic content at the test pressure marked on the fuel tank label.
[CGD 81-092, 48 FR 55737, Dec. 15, 1983]
Sec. 183.538 Metallic fuel line materials. Each metallic fuel line connecting the fuel tank with the fuel inlet connection on the engine must:
(a) Be made of seamless annealed copper, nickel copper, or copper-nickel; and
(b) Except for corrugated flexible fuel line, have a minimum wall thickness of 0.029 inches.
Sec. 183.540 Hoses: Standards and markings.
(a) ``USCG Type A1'' hose means hose that meets the performance requirements of:
(1) SAE Standard J1527DEC85, Class 1 and the fire test in Sec. 183.590; or
(2) Underwriters' Laboratories, Inc. (UL) Standard 1114.
(b) ``USCG Type A2'' hose means hose that meets the performance requirements of SAE Standard J1527DEC85, Class 2 and the fire test in Sec. 183.590;
(c) ``USCG Type B1'' hose means hose that meets the performance requirements of SAE Standard J1527DEC85, Class 1.
(d) ``USCG Type B2'' hose means hose that meets the performance requirements of SAE Standard J1527DEC85, Class 2.
Note: SAE Class 1 hose has a permeation rating of 100 grams or less fuel loss per square meter of interior surface in 24 hours. SAE Class 2 hose has a Sec. 183.542 Fuel systems.
at structure.
Sec. 183.556 Plugs and fittings.
(a) A fuel system must not have a fitting for draining fuel.
(b) A plug used to service the fuel filter or strainer must have a tapered pipethread or be a screw type fitted with a locking device other than a split lock washer.
Sec. 183.558 Hoses and connections.
(a) Each hose used between the fuel pump and the carburetor must be ``USCG Type A1'' hose.
(b) Each hose used—
(1) For a vent line or fill line must be:
(i) ``USCG Type A1'' or ``USCG Type A2''; or
(ii) ``USCG Type B1'' or ``USCG Type B2'' if no more than five ounces of fuel is discharged in 2 1/2 minutes when:
(A) The hose is severed at the point where maximum drainage of fuel would occur,
(B) The boat is in its static floating position, and
(C) The fuel system is filled to the capacity market on the tank label under Sec. 183.514(b)(3).
(2) From the fuel tank to the fuel inlet connection on the engine must be:
(i) ``USCG Type A1''; or
(ii) ``USCG Type B1'' if no more than five ounces of fuel is discharged in 2 1/2 minutes when:
(A) The hose is severed at the point where maximum drainage of fuel would occur,
(B) The boat is in its static floating position, and
(C) The fuel system is filled to the capacity marked on the tank label under Sec. 183.514(b)(3).
(c) Each hose must be secured by:
(1) A swaged sleeve;
(2) A sleeve and threaded insert; or
(3) A hose clamp.
(d) The inside diameter of a hose must not exceed the actual minor outside diameter of the connecting spud, pipe, or fitting by more than the distance shown in Table 8.
Table 8
[CGD 74-209, 42 FR 5950, Jan. 31, 1977, as amended by CGD 85-098, 52 FR 19728, May 27, 1987]
Sec. 183.560 Hose clamps: Installation. Each hose clamp on a hose from the fuel tank to the fuel inlet connection on the engine, a hose between the fuel pump and the carburetor, or a vent line must:
(a) Be used with hose designed for clamps;
(b) [Reserved]
(c) Be beyond the bead, flare, or over the serrations of the mating spud, pipe, or hose fitting; and (
d) Not depend solely on the spring tension of the clamp for compressive force. [CGD 74-209, 42 FR 5950, Jan. 31, 1977, as amended by CGD 81-092, 48 FR 55737, Dec. 15, 1983]
Sec. 183.562 Metallic fuel lines.
(a) Each metallic fuel line that is mounted to the boat structure must be connected to the engine by a flexible fuel line.
(b) Each metallic fuel line must be attached to the boat's structure within four inches of its connection to a flexible fuel line. safe boating,
dave
None
