Rick..... .you write..... ."The engine runs for about fifteen minutes, until the filter empties. It then takes about an hour or so for the filter to refill"..... ..would it surprize you to learn that is just about the time frame for a CLOGGED inside the fueltank filter to leak-fill yer carburetor & extra filter? Did you know that there is an inside the fueltank cylindric screen filter for bigg-chunks that eventually "melts" and cloggs the fuel-valve down-pipe? Unfortunately, the ONLY CURE is a brand NEW fuel-valve with new glass bowl screen. As for yer extra fuel-line filter, as long as it looks EMPTY (no fuel) while running, it is working good. When it starts to fill-up with fuel, the filter is cloggin' and you need to replace it. Don't forget, there is also a fuel-filter screen inside the carb elbow. As the guys claim, you really don't need the 4th-filter, but I have no problem with 4-filters. I do every fall put some "dry-gas" in my tank (soaks up rust causing water) and then I also put some "Stabil" anti-clogging gas additive..... ..Dell
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