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Vehicle and Engine Certification

Lists of EPA-Compliant Alternative Fuel Conversion Systems

On this page:

All of these lists are updated periodically. Please check back for updates.

Conversion Systems for New Vehicles or Engines

Certified conversion systems may be applied to new and relatively new, intermediate age, or outside useful life vehicles/engines covered by the conversion certificate.

In order to be included on this list, a conversion system must be issued a certificate of conformity. However, due to processing differences, not all conversion systems that have a certificate are included.

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Conversion Systems for Intermediate-Age Vehicles or Engines

Conversion systems on this list may be applied to intermediate age or to outside useful life vehicles/engines covered by the conversion manufacturer's compliance demonstration.

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Conversion Systems for Outside Useful Age Vehicles or Engines 

Conversion systems on this list may only  be applied to vehicles/engines that have exceeded their regulatory useful life as indicated in the conversion manufacturer's compliance demonstration.

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