Had a similar problem on a new-to-me engine recently. Engine would run good for a while then die. No fuel pump involved--just gravity flow. Replaced line, shut-off valve and filter with no improvement. Upon further troubleshooting noticed that I got very low flow even when I ran fuel straight out of the tank into a bowl held beneath the outlet with the tank cover off. Turned out the tank had an internal filter at the outlet and it was plugged nearly solid. With no way to eliminate it short of replacing the tank, another filter already inline downstream, and nothing to lose, I ran a small drill bit by hand up into the outlet and drilled through the filter. Reinstalled line and got full flow, and it's had 100+ hours of run time since with no further problems. Just something you might want to investigate before replacing more parts.
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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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