Before I put the pump on it the motor died due to the low end being too rich . It hessitated during transition to full throttle and died . Thats when I toasted the front end of the plane . It would never run properly on the top end at a rich break-in setting . After I fixed the plane I bought the pump . I also moved the tank back 3" when the plane was repaired so there is no going back now. I will run forever on the ground it seems like . I can idle however long and hammer the throttle with no hessitation at all . Full throttle at the snap of a finger . My problem is after 5-7 min of flight it dies . That 5-7min of flight it works great . With tumbles , verticlals , etc . I have a .46ax and have no problems with it at all . The 5-7min thing has got me stumpted .