The United States plans to ask its Persian Gulf allies to come up with an additional $4 billion to $5 billion in aid next year for Jordan, Egypt and Turkey to compensate for losses related to the gulf crisis, a senior Treasury official said yesterday.

A committee working under the chairmanship of Treasury Undersecretary David Mulford had earlier received pledges from 25 nations now estimated at about $13.4 billion, of which about $10.8 billion was earmarked for Jordan, Egypt and Turkey. But it has always been assumed, the Treasury official said, that even if the confrontation with Iraq were settled "relatively quickly, there would be additional requirements" to be met for 1991.

He added that there also is concern that "after you had made the emergency transfusion in 1990, {and had taken care of} the immediate shock, another question to be addressed for 1991 is how to assure that the economic reform process that was underway continues."

He cited, as examples, the effort Egypt has been making to meet the demands of major Western creditor nations, and the effort both Jordan and Turkey are making to qualify for World Bank loans.

So far, Japan has committed $2 billion and European nations have pledged $2.2 billion in aid. The Treasury official said that although "we wouldn't be shy" about asking Japan or the European countries to advance more money, the likelihood now is that the extra $4 billion to $5 billion being sought can easily be paid out of surplus oil revenue accruing to the producing states in the gulf. He said that even if oil prices decline, the revenue of the gulf states "won't slack off immediately."

Overall, he said, the United States is "satisfied with the magnitude of the commitment for economic aid at the moment," although somewhat concerned about the speed and the pattern of the disbursement to the targeted countries. "We are hoping," he said, that all of the money committed for 1990 will be disbursed by the end of the year. He estimated that somewhat over 30 percent of the $13.4 billion had now been disbursed.

Of $2.2 billion pledged by Europe, $1.5 billion was committed by individual countries and $700 million by the European Community itself. But none of the $700 million has yet been disbursed. The actual flow of money from Japan has also been slow, the official said.