1. (a) [Reserved]

2. (b) Each carburetor must not leak more than five cubic centimeters of fuel in 30 seconds when:

   1. (1) The float valve is open;
   2. (2) The carburetor is at half throttle; and
   3. (3) The engine is cranked without starting; or
   4. (4) The fuel pump is delivering the maximum pressure specified by its manufacturer.

3. (c) Each updraft and horizontal draft carburetor must have a device that:

   1. (1) Collects and holds fuel that flows out of the carburetor venturi section toward the air intake;
   2. (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. (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]