Hi, I have a almost 5 year old beckett afg oil burner. I changed the oil filter and nozzle on the burner, When I turned on furnace the pump began leaking oil,even with furnace off the pump leaks now.All connection checked ok.Is there a seal that may have gone bad inside pump. I believe the pump has a 5 year warranty on it.would this be covered.Thanks for any help. Sincerely Craig