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Found the problem... I opened up the heater and took a look where the fuel enters the heater. Due to (IMO) a really bad design, the combustion air, the fuel port, and the exhaust are all located at about the same spot with perhaps 1/4" of separation between them. Due to this, it looks as...

I have a Chinese parking heater that I've been fueling with old heating oil, run through a couple filters and a separator. Recently it stopped pumping (no clicks). I took out the pump and rinsed with some WD40, and saw that it pumped just fine when I applied 12V. So I put it back in, and now...