My car ran fine on WVO for a year (20,000 miles). I have a two tank system, each with its own FM100 filter and booster pump. I have solenoid valves for switching tanks and switching return lines. I also have the sump kit and the coils around the FM100 filter under the hood. My car starts & idles fine and drives well at freeway speeds. My problem is under acceleration or going up a hill the car begins hesitating and sort of missing and loosing power regardless of whether I am on WVO or diesel. I switched out every WVO fuel hose. The diesel system is 3/8" hose. I removed the inner screens from both boost pumps. I changed out all filters and cleaned the little metal filter. I installed a new lift pump. I get adequate WVO flow at the engine (about 4 gpm) and about 6 gpm diesel at the engine. I am thinking that my WVO system has been fine all along and that something else is plaguing me. Could it be air in the injector lines or a timing chain about to go? What else should I be checking? Thanks.