Well, I got my heater working. The truth is, like so many arduous repair tasks, in the end, I never did figure out what was the matter. Kerosene does NOT seem to go bad with age. But it's burning properities and characteristics when mixed with air continue to alude me. I changed my hoses, but the ones my friend brought were the wrong size. Maybe these are POS metric or something. I had gotten another unknown burner nozel in case mine was bad. I could not make it work. Maybe it was for a larger unit. Anyway, I was thinking, in case the kerosene in my heater was bad, I put the hose into a small soup can of Diesel. I could not make it work. Then, I used my old nozzel and found it did not work. It turned out to be plugged on the fuel side. I unplugged that in a hurry and reassembled the unit. It worked!!! I calibrated the pressure to 4.3 PSI and switched back to the kerosene supply. Still worked! It seems that several aspects of these units successful operation is quite critical. Air/Fuel mixtures and air pump pressures are quite important it seems. In the END, I can't really say what my problem was, I'm just glad after all that farting around that the thing works again without buying new parts. A year ago already, I almost bought a new nozzel on line. This thing has no idea how close it came to becoming flattened! Again, and again, I had to just keep reminding myself, "how complicated can this be"?
