Tom, I think you have an issue with fuel lift. Either there is a hole in the fuel pick up at the 15 gallon gallon level in your tank or the lift pump for some reason isn’t able to pull fuel all the way from the bottom of the tank. If you had crud and your filters were getting clogged a fuel polisher would help that but there must be other issues. I would install a 25$ vacuum gauge and see what the pump is pulling. I forget which engine you have but if the fuel pick up line is good it’s maybe pump related. Mine is a universal and the pump is pretty inexpensive, available and easy to swap out. The electric lift pump on mine pulls 1 atmosphere of vacuum and Josh’s yanmar pulls 3 or 4 if memory serves. The gauge I used is made for an oil furnace filter so it’s pretty common. The other benefit to the gauge is you can tell when your filter needs to be changed by an increase in vacuum. Either way a fuel polish won’t hurt but it probably won’t help your issue. Len Mitchell Crazy Legs 1989 37+ Midland On.
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