Federal employes won another victory yesterday in their campaign against being charged for parking spaces when the U.S. Court of Appeals refused to delay implementation of a judge's order that held that the government parking-fee program is illegal.

Royce C. Lamberth, chief of the civil division of the U.S. attorney's office, said last night that he had notified the necessary government officials that agencies should not collect any more fees under the parking program beginning today. Lamberth noted, however, that the government intended to pursue its appeal of the case.

U.S. District Judge Harold H. Greene ruled on March 3 that the fees, which were intended to cut down on energy consumption, should have been approved by Congress before they were ordered by then president Jimmy Carter. Greene's order barred any further collection of fees.

The government then asked Greene to allow fee collection while the case was being appealed, a process that could take as long as a year. Greene would agree only to a week-long postponement of his order while the government went to the appeals court to seek a longer delay.

Yesterday, the appeals court not only denied the government's request, but also indicated that it wasn't in any hurry to hear the basic case.

In a one-page order, the appellate court said that it had considered the question of expediting the case and had ordered that oral arguments be scheduled for the court's September term. A formal decision in a case involving oral arguments usually comes months later. That could mean that federal employes will be able to avoid the question of parking fees at least until 1982, unless President Reagan comes up with another plan to impose those charges.