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 - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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