If you need assistance please fill out the Diesel Hotline Assistance Form and staff will work to get back to you in one to three business days.
Near compliance and reporting deadlines, replies may take longer. Emails will be answered in the order that they are received.
To receive help by phone contact us at 1-866-6Diesel (1-866-634-3735). Staff are available to answer questions in English, Spanish or Punjabi. Calls are answered between 8:00 a.m. and 5:00 p.m, Monday through Friday; you can leave a voicemail after business hours. Calls are answered in the order they are received. Wait and response times are longest near compliance and reporting deadlines, so contact us early!