Like title states, got a Exmark WB w/ 17HP V Twin - recoil start - hydro - 1000 hours - well taken care of. Ok, here goes..noticed oil like dripping out where muffler connects to exhaust..pulled oil plug, small like gas, drained and was very thin. Cleaned carb very well, put together, ran great one week. Now today, exact same thing. I suggest fuel making it past fuel pump or carb into crankcase case. Can I just replace jet and float in carb..is fuel pump serviceable?? Thanks for any help.