To qualify for an exemption from the tampering prohibition, vehicles/engines that have been converted to operate on a different fuel must meet emission standards and related requirements as follows:
(a) The modified vehicle/engine must meet the requirements that applied for the OEM vehicle/engine, or the most stringent OEM vehicle/engine standards in any allowable grouping. Fleet average standards do not apply unless clean alternative fuel conversions are specifically listed as subject to the standards.
(1) If the vehicle/engine was certified with a Family Emission Limit for NOX, NOX HC, or particulate matter, as noted on the vehicle/engine emission control information label, the modified vehicle/engine may not exceed this Family Emission Limit.
(2) Compliance with light-duty vehicle greenhouse gas emission standards is demonstrated by complying with the N2 O and CH4 standards and provisions set forth in 40 CFR 86.1818-12(f)(1) and the in-use CO2 exhaust emission standard set forth in 40 CFR 86.1818-12(d) as determined by the OEM for the subconfiguration that is identical to the fuel conversion emission data vehicle (EDV). If the OEM complied with the light-duty greenhouse gas standards using the fleet averaging option for nitrous oxide (N2 O) and methane (CH4 ), as allowed under 40 CFR 86.1818-12(f)(2), the calculations of the carbon-related exhaust emissions require the input of grams/mile values for N2 O and CH4. Compliance with N2 O and CH4 exhaust emission standards may be optionally demonstrated by following the same procedures set forth in 40 CFR 86.1818-12(f)(2), except that the carbon-related exhaust emission value determined for the fuel conversion EDV must comply with the in-use CO2 exhaust emission standard set forth in 40 CFR 86.1818-12(d) and determined by the OEM for the subconfiguration that is identical to the fuel conversion EDV.
(3) Conversion systems for engines that would have qualified for chassis certification at the time of OEM certification may use those procedures, even if the OEM did not. Conversion manufacturers choosing this option must designate test groups using the appropriate criteria as described in this subpart and meet all vehicle chassis certification requirements set forth in 40 CFR part 86, subpart S.
Title 40 published on 2012-07-01
The following are only the Rules published in the Federal Register after the published date of Title 40.
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This is a list of United States Code sections, Statutes at Large, Public Laws, and Presidential Documents, which provide rulemaking authority for this CFR Part.