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What would cause an oil burner to leak fuel from the housing below the ignition transformer whenever the furnace runs? This is a new installation and works well but there is a small puddle under the housing every day.
It could be that the line from the pump (black thing on left) into the burner is not tight. It's a small flare fitting to a small copper tube going into the burner.It could be that the bleeder was not completely closed. This is the little thing on the bottom side of the pump that loos like an automotive grease fitting.It could be the flare connection on the main incoming oil line is not tight.You can take a paper towel and clean everything well. In an hour or so go back and use a new paper towel to locate the wet spot...OR....You could drag the guy that installed it out and have him correct it since he warranted his work for a year.
All fittings have been checked for tightness. The inside of the housing shows fuel puddling inside and there is evidence of fuel on the electrode terminals and the leak is at the seam in the burner housing below the blower wheel. There also seems to be fuel in the bottom of the air tube below the electrode/nozzle assembly as if there is more fuel going in than can be ignited and some is blowing back.
Then you could have a loose nozzle, nozzle adapter or pump seal leaking. Either way, get the guy back to make it right.