---
kind: "section"
citation: "40 C.F.R. § 1065.720"
title: "40"
number: "1065.720"
heading: "Liquefied petroleum gas."
url: "https://uscodex.org/cfr/40/1065.720"
---

# §1065.720. Liquefied petroleum gas.

- (a) Except as specified in [paragraph (b)](#b) of this section, liquefied petroleum gas for testing must meet the specifications in the following table:
- (b) In certain cases you may use test fuel not meeting the specifications in [paragraph (a)](#a) of this section, as follows:
  - (1) You may use fuel that your in-use engines normally use, such as commercial-quality liquefied petroleum gas.
  - (2) You may use fuel meeting alternate specifications if the standard-setting part allows it.
  - (3) You may ask for approval to use fuel that does not meet the specifications in [paragraph (a)](#a) of this section, but only if using the fuel would not adversely affect your ability to demonstrate compliance with the applicable standards in this chapter.
- (c) When we conduct testing using liquefied petroleum gas, we will use fuel that meets the specifications in [paragraph (a)](#a) of this section.
- (d) At ambient conditions, liquefied petroleum gas must have a distinctive odor detectable down to a concentration in air not more than one-fifth the lower flammable limit.

## Notes

### Amendments

[73 FR 37342, June 30, 2008, as amended at 79 FR 23811, Apr. 28, 2014; 86 FR 34573, June 29, 2021; 88 FR 4687, Jan. 24, 2023]

### Authority

Authority: 42 U.S.C. 7401-7671q.

### Source

Source: 70 FR 40516, July 13, 2005, unless otherwise noted.

### Amendments

[73 FR 37342, June 30, 2008, as amended at 79 FR 23811, Apr. 28, 2014; 86 FR 34573, June 29, 2021; 88 FR 4687, Jan. 24, 2023]