[Code of Federal Regulations]
[Title 40, Volume 16]
[Revised as of July 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR86.098-24]

[Page 386-387]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 86--CONTROL OF EMISSIONS FROM NEW AND IN-USE HIGHWAY VEHICLES AND ENGINES--Table of Contents
 
  Subpart A--General Provisions for Emission Regulations for 1977 and 
 
Sec. 86.098-24  Test vehicles and engines.

    Section 86.098-24 includes text that specifies requirements that 
differ from Sec. 86.096-24. Where a paragraph in Sec. 86.096-24 is 
identical and applicable to Sec. 86.098-24, this may be indicated by 
specifying the corresponding paragraph and the statement ``[Reserved]. 
For guidance see Sec. 86.096-24.''
    (a) introductory text through (a)(4) [Reserved]. For guidance see 
Sec. 86.096-24.
    (a)(5) The gasoline-fueled and methanol-fueled light-duty vehicles 
and light-duty trucks covered by an application for certification will 
be divided into groupings which are expected to have similar evaporative 
and/or refueling emission characteristics (as applicable) throughout 
their useful life. Each group of vehicles with similar evaporative and/
or refueling emission characteristics shall be defined as a separate 
evaporative/refueling emission family.
    (a)(6) For gasoline-fueled or methanol-fueled light-duty vehicles 
and light-duty trucks to be classed in the same evaporative/refueling 
emission family, vehicles must be similar with respect to the items 
listed in paragraphs (a)(6) (i) through (xii) of this section.
    (i) Type of vapor storage device (e.g., canister, air cleaner, 
crankcase).
    (ii) Basic canister design.
    (A) Working capacity--grams adsorption within a 10g. range.
    (B) System configuration--number of canisters and method of 
connection (i.e., series, parallel).
    (C) Canister geometry, construction and materials.
    (iii) Fuel system.
    (iv) Type of refueling emission control system--non-integrated or 
integrated with the evaporative control system. Further, if the system 
is non-integrated, whether or not any other evaporative emissions, e.g. 
diurnal or

[[Page 387]]

hot soak emissions, are captured in the same storage device as the 
refueling emissions.
    (v) Fillpipe seal mechanism--mechanical, liquid trap, other.
    (vi) Fill limiter system.
    (vii) Vapor control system or method of controlling vapor flow 
through the vapor line to the canister.
    (viii) Vapor/liquid separator usage.
    (ix) Purge system (valve, purge strategy and calibrations).
    (x) Vapor hose diameter and material.
    (xi) Canister location (front, rear, mid-vehicle).
    (xii) Onboard diagnostic hardware and calibrations.
    (a)(7) Where vehicles are of a type which cannot be divided into 
evaporative/refueling emission families based on the criteria listed 
above (such as non-canister control system approaches), the 
Administrator will establish families for those vehicles based upon the 
features most related to their evaporative and/or refueling emission 
characteristics.
    (a)(8) through (b)(1)(vi) [Reserved]. For guidance see Sec. 86.096-
24.
    (b)(1)(vii)(A) Vehicles of each evaporative/refueling emission 
family will be divided into evaporative/refueling emission control 
systems.
    (B) The Administrator will select the vehicle expected to exhibit 
the highest evaporative and/or refueling emissions, from within each 
evaporative/refueling family to be certified, from among the vehicles 
represented by the exhaust emission-data selections for the engine 
family, unless evaporative and/or refueling testing has already been 
completed on the vehicle expected to exhibit the highest evaporative 
and/or refueling emissions for the evaporative/refueling family as part 
of another engine family's testing.
    (C) If the vehicles selected in accordance with paragraph 
(b)(1)(vii)(B) of this section do not represent each evaporative/
refueling emission control system then the Administrator will select the 
highest expected evaporative/refueling emission vehicle from within the 
unrepresented evaporative/refueling system.
    (viii) For high-altitude evaporative and/or refueling emission 
compliance for each evaporative/refueling emission family, the 
manufacturer shall follow one of the following procedures:
    (A) The manufacturer will select for testing under high-altitude 
conditions the one nonexempt vehicle previously selected under paragraph 
(b)(1)(vii)(B) or (b)(1)(vii)(C) of this section which is expected to 
have the highest level of evaporative and/or refueling emissions when 
operated at high altitude; or
    (B) [Reserved]. For guidance see Sec. 86.096-24.
    (b)(ix) through (e)(2) [Reserved]. For guidance see Sec. 86.096-24.
    (f) Carryover and carryacross of durability and emission data. In 
lieu of testing an emission-data or durability vehicle (or engine) 
selected under paragraph (b)(1) (vii) through (viii) of this section and 
Sec. 86.096-24 (b)(1) (i) through (vii) and (b)(2) through (c), and 
submitting data therefor, a manufacturer may, with the prior written 
approval of the Administrator, submit exhaust emission data, evaporative 
emission data and/or refueling emission data, as applicable on a similar 
vehicle (or engine) for which certification has been obtained or for 
which all applicable data required under Sec. 86.098-23 has previously 
been submitted.
    (g) through (h) [Reserved]. For guidance see Sec. 86.096-24.

[59 FR 16290, Apr. 6, 1994]