I had the same problem but it was old tank fittings. Changed the fittings and added the hanger 9 pro fuel filter (HAN143) in line and added a fuel tank vent filter from Dons hobby shop. Found dirt was getting sucked into the tank from the vent so close to the ground in the prop wash. I also put the same in line filter on the fill line from my gas can to eliminate problems from there. Runs great like when I first dialed it in.