---
kind: "section"
citation: "30 C.F.R. § 36.44"
title: "30"
number: "36.44"
heading: "Maximum allowable fuel:air ratio."
url: "https://uscodex.org/cfr/30/36.44"
---

# §36.44. Maximum allowable fuel:air ratio.

- (a) When an engine is delivered to MSHA with the fuel-injection system adjusted by the applicant and tests of the exhaust-gas composition (see [§ 36.43](/cfr/30/36.43.md)) show not more than 0.30 percent, by volume, of carbon monoxide, the applicant's adjustment of the fuel-injection system shall be accepted. The maximum fuel:air ratio determined from the exhaust-gas composition shall be designated as the maximum allowable fuel:air ratio. The maximum liquid fuel rate (pounds per hour) that produces the maximum allowable fuel:air ratio shall be designated as the maximum allowable fuel rate for operating the equipment at elevations not exceeding 1,000 feet above sea level.
- (b) When the carbon monoxide content of the exhaust exceeds 0.30 percent, by volume, only near maximum power output, the maximum fuel:air ratio at which carbon monoxide does not exceed 0.30 percent shall be calculated and designated as the maximum allowable fuel:air ratio. The corresponding calculated liquid fuel rate shall be designated as the maximum allowable fuel rate at elevations not exceeding 1,000 feet above sea level.
- (c) **The maximum allowable fuel—** air ratio and maximum liquid fuel rates shall be used to calculate a liquid fuel rate-altitude table that shall govern the liquid fuel rate of engines operated at elevations exceeding 1,000 feet above sea level.

## Notes

### Authority

Authority: 30 U.S.C. 957, 961.

### Source

Source: Schedule 31, 26 FR 645, Jan. 24, 1961, unless otherwise noted.