how often do you have to change the filters on these and which one should i get airdog fp150c or the airdog df-165, thanks
http://www.xtremediesel.com/fuelsystem_8.aspx
Either will do you fine, but if it was me I would probably go bigger; I change my A.D. 150 filters once a year but I think they say there good for 30k? If I remember correctly.