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If the lines filled with air it has to push the air somewhere. It looks like the purge engages the fuel pump and sends fuel back to the tank. So that wait the air is out of the lines except for the line to the nozzle. Mine wouldn’t fill the bowl until I held purge. In cool down the arc is going...

Mine took about 20-30 seconds of holding purge the first time to get it pumping. I left the side access open so I could see it fill up the water separator on the fuel filter. But the only clogged line I had was about 6' from the nozzle in the burner compartment. So you might have lines clogged...

I went in through the heat port. Removed the burner, removed the nozzle. Nozzle was pretty clean and not clogged. Found a clog in the fuel line about even with where they brazed that stainless cover onto it. Put it all back together and works like a champ. I did notice mine doesnt have what...

Is the burner best accessed by removing the top of the unit? I have arc in the sight glass so I think I’m in the same spot as the OP and need to clean that pump to nozzle line like you said.

I have one that I started working on today. It had been drained so I was able to see the pump fill the filter to know it was working. But when holding purge it took a loooooong time to get it to show some pressure. Then when I turn to heat it goes up to 120psi and doesn’t fire. So I have to...