I have a full tank of oil and the engine is burning plenty of oil when i run it, however after running for a minute or so the no oil sensor goes off. I have pumped the oil line to ensure that no air pockets are in the line and I also did the winterizing steps three different times and the sensor is still going on. this is a new tank that was installed just days ago. the primer ball is completely full and tight. can anyone suggest anything else?