Cal. Rev. & Tax. Code § 7701

If the board deems the procedure necessary in order to insure payment to the state of the amount of taxes due from any supplier under this part, it may require the supplier to make returns and payments of taxes on a weekly basis. The supplier must then file a return each Tuesday showing the total number of gallons of motor vehicle fuel removed, entered, or sold by the supplier during the week ending the Saturday next preceding, the amount of tax due for that week and such other information as the board deems necessary for the proper administration of this article. The return shall be accompanied by a remittance payable to the Controller for the amount of tax due for the period covered.