They're not that complicated, but they can frustrate you to no end...
I have one that won't light unless the top cover is unscrewed along one side to let more air in. Otherwise it just blows a mist of fuel out the end until it cuts off automatically. It's set at the pressure specified on the tank, but it won't light. I've even tried reducing the pressure, but then it won't light at all. It has brand new everything. New fan, new nozzle, new hoses, new pump impeller, new pump cover, new sensor, new spark plug, and set to factory specs, but it won't light if the cover is screwed down.
Then I have another smaller one that won't light unless you "choke" it by holding your hands over the rear of the heater. That one's lean, right? Increasing fuel pressure even to the max doesn't help. Still needs to be choked to light. Once it's lit, it works fine for hours.
I had yet a third one that ran fine, if it was 70 degrees out.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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