Hi, I don't know how long your fuel sat in your tanks but mine sat for about 2 yrs. before I bought the boat. I had a 2040 size racor installed for each engine. I used algea killer ( Bio-Diesel, I think ) in the fuel and 2 micron filters for about 3 yrs. At first I had to buy filters by the case. Every time we went anywhere and there was a chop on the bay, I could be sure I'd need to change my filters at the next destination. If it was really bad, I'd start to loose RPM's in one or the other engine as we went along. I have changed them in the middle of the bay when it was really bad but that was not often. This was a time before I had ever heard of fuel polishing and my destinations were rarely more that a couple to 4 hrs away, in the Chesapeake Bay which is prolly nothing like your situation. I now run 10 micron filters and only need to change them, maybe twice a season not including winterization. With the 2 microns I never had to change the secondaries. I never need to change the secondaries with the 10 microns now either. ( except winterization which is not a "need to" but a common sense thing ) My point is that if you are running around locally you may be able to overcome the algea by changing filters alot and adding additive. Fortunately the Racors are pretty easy to change out. I became very proficient at it myself. I did find out the hard way that if I did not remember to shut the fuel valves when I changed the Racors, it was much more work to prime the fuel system. Also my Onan does draw through the Port Racor and the two onan block fuel filters never seemed to get clogged, the genny always ran well. Do you ever get water in your racors ? My understanding is that the algea lives on the edge of the water and the fuel. No water, no algea. Maybe there is an additive that will eliminate the water w/o using alcohol.