An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to www.epa.gov. This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

Vehicle and Engine Certification

Guidance and Templates: System Conversion for Clean Alternative Fuels to be Used on Intermediate Age and Outside Useful Life Vehicles or Engines

Use the following guidance and templates to submit compliance information for clean alternative fuels. This includes data submission for intermediate age and outside useful life conversions.

Free Viewers

You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.