41 CFR 102-34.315 - How do we obtain fuel for Government motor vehicles?
You may obtain fuel for Government motor vehicles by using:
(a) A Government-issued charge card;
(b) A Government agency fueling facility; or
(c) Personal funds and obtaining reimbursement from your agency, if permitted by your agency. You must use the method prescribed by GSA Fleet to obtain fuel for vehicles leased from GSA fleet.