US Secretary of State Condoleezza Rice stressed that pledges made at the Paris conference were for the Palestinian people, not the US.
Ms Rice was careful not to pinpoint individual Arab states for criticism
“Clearly when you make a pledge you ought to fulfil it,” she said after the talks.
US officials say that of $717m promised by Arab League members, only $153m of Arab pledges have been delivered, all from three countries: Saudi Arabia, the UAE and Algeria.
Ms Rice is due to hold three-way talks with Palestinian Prime Minister Salam Fayyad and Israeli Foreign Minister Tzipi Livni.
BBC diplomatic correspondent Bridget Kendall says there is a sense of urgency at the talks, with one official warning that the Palestinian Authority is in danger of financial collapse.