[Code of Federal Regulations]
[Title 40, Volume 31]
[Revised as of July 1, 2007]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR1051.245]

[Page 638-639]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 1051_CONTROL OF EMISSIONS FROM RECREATIONAL ENGINES
AND VEHICLES--Table of Contents
 
                  Subpart C_Certifying Engine Families
 
Sec.  1051.245  How do I demonstrate that my engine family complies with
evaporative emission standards?

    (a) For purposes of 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 permeation emission levels from 
the fuel tanks and fuel lines in the family are at or below the 
standards in Sec.  1051.110 throughout the useful life.
    (2) You comply with the design specifications in paragraph (e) of 
this section.
    (b) Your engine family is deemed not to comply if any fuel tank or 
fuel line representing that family has test results showing a 
deteriorated emission level above the standard.
    (c) To compare emission levels with the emission standards, apply 
deterioration factors to the measured emission levels. For permeation 
emissions, use the following procedures to establish an additive 
deterioration factor, as described in Sec.  1051.240(c)(2):
    (1) Section 1051.515 specifies how to test your fuel tanks to 
develop deterioration factors. Small-volume manufacturers may use 
assigned deterioration factors that we establish. Apply the 
deterioration factors as follows:
    (i) Calculate the deterioration factor from emission tests performed 
before and after the durability tests as described in Sec.  1051.515(c) 
and (d), using good engineering judgment. The durability tests described 
in Sec.  1051.515(d) represent the minimum requirements for determining 
a deterioration factor. You may not use a deterioration factor that is 
less than the difference between evaporative emissions before and after 
the durability tests as described in Sec.  1051.515(c) and (d).
    (ii) Do not apply the deterioration factor to test results for tanks 
that have already undergone these durability tests.
    (2) Determine the deterioration factor for fuel lines using good 
engineering judgment.
    (d) Collect emission data using measurements to one more decimal 
place than the applicable standard. Apply the deterioration factor to 
the official emission result, as described in paragraph (c) of this 
section, then round the adjusted figure to the same number of decimal 
places as the emission standard. Compare the rounded emission levels to 
the emission standard for each emission-data vehicle.
    (e) You may demonstrate for certification 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.  
1051.110(a) with the control technologies shown in the following table:

    Table 1 of Sec.  1051.245--Design-certification Technologies for
                       Controlling Tank Permeation
------------------------------------------------------------------------
                                                 Then you may design-
 If the tank permeability control technology      certify with a tank
                  is . . .                      emission level of . . .
------------------------------------------------------------------------
(i) A metal fuel tank with no non-metal       1.5 g/m \2\/day.
 gaskets or with gaskets made from a low-
 permeability material \1\.
(ii) A metal fuel tank with non-metal         1.5 g/m \2\/day.
 gaskets with an exposed surface area of
 1000 mm \2\ or less.
------------------------------------------------------------------------
\1\ Permeability of 10 g/m \2\/day or less according to ASTM D 814-95
  (incorporated by reference in Sec.  1051.810).


[[Page 639]]

    (2) For certification to the standards specified in Sec.  
1051.110(b) with the control technologies shown in the following table:

    Table 2 of Sec.  1051.245--Design-Certification Technologies for
                    Controlling Fuel-Line Permeation
------------------------------------------------------------------------
                                                 Then you may design-
    If the fuel-line permeability control      certify with a fuel line
             technology is . . .               permeation emission level
                                                       of . . .
------------------------------------------------------------------------
(i) Hose meeting Category 1 permeation        15 g/m\2\/day.
 specifications in SAE J2260 (incorporated
 by reference in Sec.  1051.810).
(ii) Hose meeting the R11-A or R12            15 g/m\2\/day.
 permeation specifications in SAE J30
 (incorporated by reference in Sec.  
 1051.810).
------------------------------------------------------------------------

    (3) We may establish additional design certification options where 
we find that new test data demonstrate that the use of other technology 
designs will ensure compliance with the applicable emission standards.

[67 FR 68347, Nov. 8, 2002, as amended at 69 FR 2442, Jan. 15, 2004; 70 
FR 40497, July 13, 2005]