Cal. Rev. & Tax. Code § 8104.5

If any person does not use motor vehicle fuel as provided in subdivision (a) of Section 8101 within the time required for filing an application for a refund, he may within that time file a written request with the Controller for an extension of time within which to apply for a refund. The request shall state the amount of fuel involved, the date of its purchase, and the manner and the equipment in which the fuel is intended to be used. Thereupon the Controller may extend the time within which an application for refund may be filed.