Cal. Rev. & Tax. Code § 7401
(a) The provisions of this part requiring the payment of motor vehicle fuel taxes do not apply to any of the following:
(2) The removal of motor vehicle fuel, if all of the following apply:
(3) Motor vehicle fuel which, pursuant to the contract of sale, is required to be shipped and is shipped to a point outside of this state by a supplier by means of any of the following:
(4) Motor vehicle fuel sold by credit card certified by the United States Department of State to any consulate officer or consulate employee of a foreign government who is not engaged in any private occupation for gain within this state, who uses the motor vehicle fuel in a motor vehicle that is registered with the United States Department of State, and whose government has done either of the following:
(b) For purposes of this section: