Has anyone else had any problems with the check valves sticking while using the RASP fuel pump? I have been having constant problems with the return check valve sticking open and letting air backflow into the filter housing causing the truck to misfire and then not letting the pump build pressure at crusing speed. I have had the check valve off over two dozen times and cannot visually see any debris in it causing it to stick open. I even tried to install a different style poppet in the valve to see if that helped but it dident. It seems to be an intermittent problem sometimes much worse than others.