SEC. 247. VEHICLE CONVERSIONS.
  (a)  Conversion of  Existing and  New Conventional  Vehicles to
Clean-Fuel Vehicles.- The requirements of section 246 may  be met
through the  conversion of  existing or new  gasoline or  diesel-
powered  vehicles to  clean-fuel vehicles  which comply  with the
applicable  requirements of  that section.  For purposes  of such
provisions the  conversion  of a  vehicle to  clean fuel  vehicle
shall be treated as the purchase of a clean fuel vehicle. Nothing
in this part shall be construed to provide that any covered fleet
operator  subject to  fleet vehicle  purchase  requirements under
section 246 shall be required to convert existing or new gasoline
or diesel-powered vehicles to  clean-fuel vehicles or to purchase
converted vehicles.
  (b)  Regulations.- The  Administrator shall,  within 24  months
after  the enactment  of the  Clean Air  Act Amendments  of 1990,
consistent with the requirements of this title  applicable to new
vehicles,   promulgate   regulations  governing   conversions  of
conventional  vehicles to  clean-fuel vehicles.  Such regulations
shall establish  criteria for such conversions  which will ensure
that  a   converted  vehicle  will  comply   with  the  standards
applicable  under   this  part   to  clean-fuel   vehicles.  Such
regulations shall provide for the application to such conversions
of  the  same  provisions  of this  title  (including  provisions
relating  to  administration enforcement)  as  are applicable  to
standards  under section 242, 243,  244, and 245,  except that in
the  case  of  conversions   the  Administrator  may  modify  the
applicable   regulations  implementing  such  provisions  as  the
Administrator deems necessary to implement this part.
  (c) Enforcement.- Any person who converts conventional vehicles
to  clean  fuel vehicles  pursuant  to subsection  (b),  shall be
considered a  manufacturer for purposes  of sections 206  and 207
and  related  enforcement provisions.  Nothing  in  the preceding
sentence shall require a person who  performs such conversions to
warrant any part or operation of a vehicle other than as required
under  this  part. Nothing  in  this  paragraph  shall limit  the
applicability  of  any  other  warranty  to  unrelated  parts  or
operations.
  (d)  Tampering.-  The  conversion  from a  vehicle  capable  of
operating on gasoline or diesel fuel only to a clean-fuel vehicle
shall  not be considered a violation of section 203(a)(3) if such
conversion  complies  with  the  regulations   promulgated  under
subsection (b).
  (e) Safety.-  The Secretary of Transportation  shall, if neces-
sary, promulgate rules under applicable motor vehicle laws
regarding the safety  of vehicles converted from existing and new
vehicles to clean-fuel vehicles.
[42 U.S.C. 7587]