The government's bank deposit insurance fund will run out of money "within a year or so" and require a loan of taxpayer money, congressional budget analysts warn.

Congress should quickly lift the $5 billion limit on how much the Federal Deposit Insurance Corp. can borrow from the Treasury, Robert D. Reischauer, director of the Congressional Budget Office, told the Senate Banking Committee.Without a loan from the Treasury, the FDIC's fund will not have enough money to handle bank failures much beyond the end of the 1991 fiscal year on Sept. 30, he said in a statement delivered Wednesday to the panel.

"Within a year or so, the fund will be out of cash and insolvent without some . . . infusion," he said. "At minimum, some temporary financing seems to be needed immediately."

The CBO is projecting that the balance in the fund, which protects $2.2 trillion in bank deposits, "would almost disappear" by the end of (fiscal year) 1991" on Sept. 30.