Fueling American Prosperity Act This bill requires the Department of the Interior to carry out sales of onshore and offshore oil and gas leases. If the sales are not carried out, the bill limits Interior from hiring, transferring, or reassigning duties among officers and employees. In addition, the bill (1) requires Interior to finalize its next offshore oil and gas leasing program by June 30, 2022; and (2) sets deadlines by which certain environmental assessments and environmental impact statements must be completed if the national average price of gasoline exceeds a specified threshold.