---
kind: "section"
citation: "33 C.F.R. § 183.526"
title: "33"
number: "183.526"
heading: "Carburetors."
url: "https://uscodex.org/cfr/33/183.526"
---

# §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,

## Notes

### Amendments

[CGD 74-209, 42 FR 5950, Jan. 31, 1977, as amended by CGD 77-98, 42 FR 36253, July 14, 1977]

### Source

Source: CGD 74-209, 42 FR 5950, Jan. 31, 1977, unless otherwise noted.

### Authority

Authority: 46 U.S.C. 4302; Pub. L. 103-206, 107 Stat. 2439; and Department of Homeland Security Delegation No. 0170.1, para. II, (92)(b). Subpart E is also authorized by Pub. L. 114-120, 130 Stat. 27

### Source

Source: CGD 72-61R, 37 FR 15782, Aug. 4, 1972, unless otherwise noted.

### Amendments

[CGD 74-209, 42 FR 5950, Jan. 31, 1977, as amended by CGD 77-98, 42 FR 36253, July 14, 1977]