[Code of Federal Regulations]
[Title 40, Volume 30]
[Revised as of July 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR1065.201]

[Page 659]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 1065_TEST PROCEDURES AND EQUIPMENT--Table of Contents
 
                Subpart C_Test Fuels and Analytical Gases
 
Sec. 1065.201  General requirements for test fuels.


    (a) For all emission tests, use test fuels meeting the 
specifications in this subpart, unless the standard-setting part directs 
otherwise. For any service accumulation on a test engine, if we do not 
specify a fuel, use the specified test fuel or a fuel typical of what 
you would expect the engine to use in service.
    (b) We may require you to test the engine with each type of fuel it 
can use (for example, gasoline and natural gas).
    (c) If you will produce engines that can run on a type of fuel (or 
mixture of fuels) that we do not specify in this subpart, we will allow 
you to test with fuel representing commercially available fuels of that 
type. However, we must approve your fuel's specifications before you may 
use it for emission testing.
    (d) You may use a test fuel other than those we specify in this 
subpart if you do all of the following:
    (1) Show that it is commercially available.
    (2) Show that your engines will use only the designated fuel in 
service.
    (3) Show that operating the engines on the fuel we specify would 
increase emissions or decrease durability.
    (4) Get our written approval before you start testing.
    (e) We may allow you to use other test fuels (for example, 
California Phase 2 gasoline) if they do not affect the demonstration of 
compliance.