Why wont my grease burner deliver hot hose, or warmth up the heat system, its approaching it dosnt vom up? its not the thermostat, or pump, yes i have get oil...

its not the thermostat, or pump, yes i have get oil surrounded by the tank..

Answers: Perhaps its within need of a service,the electrode and the photo cell take coated in soot if its not burning correctly and eventually it stops firing.