This document is the User Guide for the OTAQ DC FUEL online application. It describes the process a user must follow to submit reports using DC FUEL. This document will cover registration, how to upload a file and submit a report, and how to view your copy of record. If you have any questions about the content, format, or policies for the Office of Transportation and Air Quality (OTAQ) please reference the Fuels Program website at http: //www.epa.gov/otaq/fuels/index.htm. If you have any general or technical questions related to the Central Data Exchange (CDX) you may contact any of the following: Telephone - Person-to-person telephone support is available from the CDX Help Desk 8:00 am to 6:00 pm EST. Call our toll-free line at 888-890-1995. Email - Send e-mail to Technical Support at helpdesk@epacdx.net with "Technical Support" in the Subject line. If you have any questions relating to fuels programs registration, reporting, or DC FUEL, please contact the EPA Fuels Programs and EMTS Support Line: support@epamts-support.com.