---
kind: "section"
citation: "46 C.F.R. § 63.15-3"
title: "46"
number: "63.15-3"
heading: "Fuel system."
url: "https://uscodex.org/cfr/46/63.15-3"
---

# §63.15-3. Fuel system.

- (a) Firing of an automatic auxiliary boiler by natural gas is prohibited unless specifically approved by the Marine Safety Center.
- (b) Heated heavy fuel oil may be used provided the heaters are equipped with a high temperature limiting device that shuts off the heating source at a temperature below the flashpoint of the oil and is manually reset. When a thermostatically-controlled electric oil heater and a level device is used, it must meet the requirements of [subpart 111.85](/cfr/46/subpart111.85.md) of this chapter.
- (c) The fuel oil service pump and its piping system must be designed in accordance with [§ 56.50-65](/cfr/46/56.50-65.md) of this subchapter. All materials must meet the requirements of [subpart 56.60](/cfr/46/subpart56.60.md) of this subchapter. The use of cast iron or malleable iron is prohibited.
- (d) The fuel oil service system (including the pump) must meet the pressure classification and design criteria found in table 1 to [§ 56.04-2](/cfr/46/56.04-2.md) of this subchapter.
- (e) When properly selected for the intended service, fuel pumps meeting the performance and test requirements of UL 343 (incorporated by reference, see [§ 63.05-1](/cfr/46/63.05-1.md)) meet the requirements of this section.

## Notes

### Amendments

[CGD 88-057, 55 FR 24238, June 15, 1990, as amended by USCG-2003-16630, 73 FR 65191, Oct. 31, 2008]

### Source

Source: CGD 88-057, 55 FR 24238, June 15, 1990, as amended by USCG-2020-0634, 89 FR 50197, June 12, 2024, unless otherwise noted.

### Authority

Authority: 46 U.S.C. 3306, 3703; E.O. 12234, 45 FR 58801, 3 CFR, 1980 Comp., p. 277; Department of Homeland Security Delegation No. 00170.1, Revision No. 01.3.

### Source

Source: CGD 88-057, 55 FR 24238, June 15, 1990, unless otherwise noted.

### Amendments

[CGD 88-057, 55 FR 24238, June 15, 1990, as amended by USCG-2003-16630, 73 FR 65191, Oct. 31, 2008]