The most common reason for this is air leaks. Every hose in the system will degrade over time from exposure to petroleum products. That is a good starting point. Since fuel is drawn up from the tank by vacuum from the venturi effect, it is critical to have all hoses and lines airtight.
The photocell is another potential source of trouble. There are two types of photocells. They have different resistance characteristics, but they look and fit alike. They are NOT interchangeable. I found this out long ago when I got a used heater at an auction. It would run for a few minutes and quit. Nothing I did seemed to help. Some research found that the photocell had been replaced with the wrong one.
The safety circuit is rather simple. The photocell is wired in parallel with a heater type slow acting circuit breaker that powers the pump. As the pump operates, current flows through the circuit breaker and photocell. When the photocell "sees" the flame, its resistance goes lower and effectively bypasses the breaker. If the photocell does NOT see the flame, resistance stays high and more current flows through the breaker. The breaker heats up and opens the circuit shutting off the heater.
One thing to also mention is your choice of fuel. I had one heater that I received with a full tank of diesel fuel. On colder days, it did not run well. The fuel was getting thicker as the temperature fell into the lower teens and was not being drawn up well from the tank. I actually had to use another smaller heater aimed at the fuel tank to warm it up to get it running. I also noticed that there is a lot more fumes/smell when you run it on diesel as compared to kerosene. I much prefer to run mine on kerosene.
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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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