[larry browning]

I ran out of fuel oil and had the local fuel oil co. bring a delivery; now I think I have air in the inlet feed of my line to the furnace; how do I bleed this unit, it is a intertherm mac 1280 series unit

[KC13]

You will need some type of container (coffee can works well) and a piece of small tubing (a straw will work in a pinch). Locate the purge nipple on the fuel pump - usually resembles an automotive brake bleeder fitting. Put a wrench on the fitting, followed by the straw, with the container in place to catch the fuel. Start the burner and open the nipple to allow air to escape - you may have to reset the primary control a few times, but continue until a solid stream of fuel comes out. Close nipple between purge attempts if primary control locks out. Once purged the burner should fire. If it does not, the nozzle and/or fuel filter may be fouled and will require professional servicing.

[dac122]

FYI, by letting your tank run dry, you run the risk of sucking up sediment and plugging things.

[hvac1000]

If you ran out of fuel it is always best to change the filter also.