For FLL - No biofuel here. Just good ol' low sulfur petroleum heating oil as far as I know. I don't know that Walmart sells it. :-)
The tech was here for a little under two hours. He checked everything over and again said it was getting too much air to the burner. He adjusted the air flow, as well as replacing the screw on filter on the oil line, the oil nozzle, and the strainer (although he said that none of those items looked bad, but the strainer was a little dirty). He said the unit appears to be in great shape.
He checked the Cad cell and said it was fine. He also did a smoke efficiency test (old paper test, but I didn't see tummyman's post until later). He couldn't explain why this only seems to happen immediately following an oil fill.
At any rate, everything seems to be working properly for the time being. If the problem occurs again following the March fill, The next step will be the Tiger Loop filter that tummyman has suggested.
A big THANK YOU to everyone here who offered information and ideas!!
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