A fuel delivery system of a machine capable of efficiently feeding fuel, where a time of feeding fuel to a construction machine is estimated based on operation information of the construction machine. Based on position information of the construction machine acquired by position information acquiring means and estimated time of feeding fuel, a delivery schedule, which has a short moving distance and capable of delivering and feeding fuel efficiently in a short period of time, is formed. The delivery schedule is notified to a controller of the construction machine. The delivery schedule is reconstructed by a set input of a change in the delivery schedule from the controller. A specified form for requesting expense of feeding fuel is automatically formed from a fuel feeding amount after fuel has been delivered and fed by the formed delivery schedule and confirming to feed fuel.