Met with David at 253 Mountain Rd. In Shokan, NY. Whom quickly showed me the oil tank and furnace. Could not change the oil tank filter as it is outside without a filter cartridge. Moved to the inside furnace and removed the pump cover, replaced the pump gasket and strainer. Unit was bone dry. Opened up the burner and removed the gun assembly. Took outside and cleaned the gun assembly, electrodes and nozzle. Check the adjustments and settings and they appear to be good. Could not light off the furnace, as the oil tank was empty. A combustion test is recommended for this unit.