Dan, I think DDW was saying that he fuel is already being filtered a lot. Just by running the engine, his primary and secondary filters are filtering 50 gallons/hr. That keeps the fuel clean, but his concern is with how clean the tank is. Crud could have precipitated out and settled to the bottom of the tank even if the fuel above it is being actively filtered.
DDW is thinking about cleaning the tank, not necessarily about how to keep the fuel filtered.
Again, I wouldn't worry about it unless he notices a problem with his filters getting clogged up. I have access to good fuel, so my boat is 8 years old but I have yet to see any vacuum increase on my filters.
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