That "flame sensor" in the pilot flame only shuts the gas off to the pilot if the pilot goes out. It is called a thermocouple and if you are not having trouble with the pilot going out it is OK.
You do have a real "flame sensor" that lives somewhere in the burner flame that shuts the gas off in case the burner does not light for some reason. It is a valuable safety feature but they do get dirty and when they fail they often exhibit the symptom you describe.
You can easily clean it with a dollar bill or, as my favorite HVAC guy does, you can use a $100 dollar bill to show off a bit. Of course no harm comes to the bill. Just wrap the bill around the sensor and gently rub. DO NOT USE SANDPAPER! The coating on the sensor is thin and sensitive but can be cleaned gently.
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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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