---
kind: "section"
citation: "33 C.F.R. § 183.520"
title: "33"
number: "183.520"
heading: "Fuel tank vent systems."
url: "https://uscodex.org/cfr/33/183.520"
---

# §183.520. Fuel tank vent systems.

- (a) Each fuel tank must have a vent system that prevents pressure in the tank from exceeding 80 percent of the pressure marked on the tank label under [§ 183.514(b)(5)](/cfr/33/183.514.md?p=b-5).
- (b) **Each vent must—**
  - (1) Have a flame arrester that can be cleaned unless the vent is itself a flame arrestor; and
  - (2) **Not allow a fuel overflow at the rate of up to two gallons per minute to enter the boat.**

## 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]