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CODE OF FEDERAL REGULATIONS – TITLE
33 – NAVIGATION AND NAVIGABLE WATERS
PART 183—BOATS AND ASSOCIATED
EQUIPMENT
Subpart J—Fuel Systems
Sec. 183.524—Fuel pumps
(a) Each diaphragm pump must not leak fuel from
the pump if the primary diaphragm fails.
(b) Each electrically operated fuel pump must
not operate except when the engine is operating or when the
engine is started.
(c) If tested under Sec. 183.590, each fuel
pump, as installed in the boat, must not leak more than five
ounces of fuel in 2-1/2 minutes, inclusive of leaks from fuel
line, fuel filter and strainer.
[CGD 74-209, 42 FR 5950, Jan. 31, 1977,
as amended by CGD 77-98, 42 FR 36253, July 14, 1977]
Sec. 183.526—Carburetors
(a) [Reserved]
(b) Each carburetor must not leak more than
five cubic centimeters of fuel in 30 seconds when:
(1) The float valve is open;
(2) The carburetor is at half throttle; and
(3) The engine is cranked without starting;
or
(4) The fuel pump is delivering the maximum
pressure specified by its manufacturer.
(c) Each updraft and horizontal draft carburetor
must have a device that:
(1) Collects and holds fuel that flows out
of the carburetor venturi section toward the air intake;
(2) Prevents collected fuel from being carried
out of the carburetor assembly by the shock wave of a backfire
or by reverse air flow; and
(3) Returns collected fuel to the engine induction
system after the engine starts,
[CGD 74-209, 42 FR 5950, Jan. 31, 1977,
as amended by CGD 77-98, 42 FR 36253, July 14, 1977]
Sec. 183.528—Fuel stop valves
(a) Each electrically operated fuel stop valve
in a fuel line between the fuel tank and the engine must:
(1) Open electrically only when the ignition
switch is on; and
(2) Operate manually.
(b) If tested in accordance with the fire test
under Sec. 183.590, a fuel stop valve installed in a fuel
line system requiring metallic fuel lines or “USCG Type
A1” hose must not leak fuel.
[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 serrations
no less than 0.015 inches deep, except a continuous helical
thread, knurl, or groove.
[CGD 74-209, 42 FR 5950, Jan. 31, 1977,
as amended by USCG-1999-5832, 64 FR 34716, June 29, 1999]
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]
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