My fass is the 150 gph unit and has about 35,000 installed last jan. Since it was installed it has made a constant loud whine very audible in the back in the camper. Not a problem for me, it has been a very comforting sound. A month or so ago i noticed that the whine would stop for a few seconds and then start again this is mainly at idle but i think it is doing it under load as well. Fuel pressure gauge to be put in this week. Been working too many hours to fool with it till now. Anybody have any comments?