[Code of Federal Regulations]

[Title 40, Volume 31]

[Revised as of July 1, 2006]

From the U.S. Government Printing Office via GPO Access

[CITE: 40CFR1048.245]



[Page 568-569]

 

                   TITLE 40--PROTECTION OF ENVIRONMENT

 

         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)

 

PART 1048_CONTROL OF EMISSIONS FROM NEW, LARGE NONROAD SPARK-IGNITION 

ENGINES--Table of Contents

 

                  Subpart C_Certifying Engine Families

 

Sec.  1048.245  How do I demonstrate that my engine family complies with 

evaporative emission standards?



    (a) For certification, your engine family is considered in 

compliance with the evaporative emission standards in subpart B of this 

part if you do either of the following:

    (1) You have test results showing that evaporative emissions in the 

family are at or below the standards throughout the useful life.

    (2) Where applicable, you comply with the design specifications in 

paragraph (e) of this section.

    (b) Your engine family does not comply if any fuel system 

representing that family has test results showing emission levels above 

the standards.

    (c) Use good engineering judgment to develop a test plan to 

establish deterioration factors to show how much emissions increase at 

the end of useful life.

    (d) If you adjust the emission levels for deterioration, round them 

to the same number of decimal places as the emission standard. Compare 

the rounded emission levels to the emission standard for each test fuel 

system.

    (e) You may demonstrate that your engine family complies with the 

evaporative emission standards by demonstrating that you use the 

following control technologies:

    (1) For certification to the standards specified in Sec.  

1048.105(a)(1), with the following technologies:

    (i) Use a tethered or self-closing gas cap on a fuel tank that stays 

sealed up to a positive pressure of 24.5 kPa (3.5 psig) or a vacuum 

pressure of 0.7 kPa (0.1 psig).

    (ii) [Reserved]

    (2) For certification to the standards specified in Sec.  

1048.105(a)(3), demonstrating that you use design features



[[Page 569]]



to prevent fuel boiling under all normal operation. You may do this 

using fuel temperature data measured during normal operation.

    (3) We may establish additional options for design-based 

certification where we find that new test data demonstrate that a 

technology will ensure compliance with the emission standards in this 

section.



[67 FR 68347, Nov. 8, 2002, as amended at 70 FR 40474, July 13, 2005]