The bank sold $118 million at an unchanged rate of 8.78 per dollar.
Egypt is facing an acute dollar shortage that sent its foreign reserves down to $15.5 billion in July, near a critical level that would cover only three months of imports.
A widening gap between official and black market rates for the dollar has increased pressure to devalue the currency. Two black market traders cited a selling range of 12.50-12.65 pounds per dollar on Tuesday but gave no indication of trade volumes.
Egypt has reached an agreement with the International Monetary Fund over a $12 billion three-year lending programme that it hopes will plug the nation's funding gap and restore market confidence, encouraging investment that could help to ease the currency crunch.