I run a 2001 Yamaha 2 stroke on a 1988 v-20 cuddy. The boat started to bog down and wouldn't go over 1100 rpms. Pulled the boat and was told it was probably ethanol that was the culprit. There is a high preassure pump (fuel injected)located in a tank in the engine. They looked at the screen changed the filter and told me it was all gunked up with a white powdery substance. $300 00 dollars later they cleaned the screen and put it back in the water. Approx 2 hrs of running time same problem. I also noticed the boat didn't have the usual p/u and go, couldn't get it to go over 4100 rpms. Pulled the boat and was told this pump had to be replaced. These pumps go $700 and look like the cardboard portion of a toilet roll. Changed the filter/pump again and the boat screams. Somebody mentioned a product out there you add to you tank, it comes in a clear bottle and is blue in color Anybody know anything about it. Suppose to help with this problem. By the way my tank was manf. by a Co called INCA Manf. located in Indianna I think, its plastic and the engineer was very interested in this problem and asked if I would keep him updated. If you need to talk to them thier located on the internet via Google.