(1) All necessary expenses actually incurred by the governing body of any city or town in the making of surveys, estimates of costs and revenues, employment of engineers or other employees, the giving of notices, taking of options and all other expenses of whatever nature, necessary to be paid prior to the issuance and delivery of the revenue bonds pursuant to this part, may be met and paid in the following manner: The governing body may from time to time certify such items of expenses to the proper fiscal agent of the city or town, directing the fiscal agent to pay the several amounts of the expenses; and
(2) The expenses shall be paid out of the general fund of such city or town not otherwise appropriated, or from any other available fund without a special appropriation being made for the payments by the governing body of the city or town.
(3) All such payments from the general or other funds shall be considered as temporary loans and shall be repaid immediately upon sale and delivery of the bonds, and claim for such repayment shall have priority over all other claims against the proceeds derived from the sale of the bonds.