Step by step, this is what I would do: 1> put some fresh gas in the boat 2> disconnect the main fuel line from the input side of the Racors 3> pump several gallons of gas out using an external pump, this will ensure you have removed any crap from the bottom of the tank, the pickup tube, the anti-siphon valve and the main fuel line 4> replace the Racor filters, be sure to put some oil on the gasket(s) 5> replace the primer bulbs (the Ethanol phase separated slime will eat the inside and cause the check valve to malfunction) 6> replace the engine mounted fuel filters 7> remove the VST tank, clean it, replace the screen, replace the o-ring 8> replace the F-Shaped filter That about does it. If you still can't reach the rpms you once could, more bad news, clogged fuel injectors. The good news is there is a place that can help: http://www.brucatosvs.com/fuel_injector.html They did wonders for my fuel injectors. Over time, they get clogged regardless of what you do. Sorry for your troubles, unfortunately, this is beginning to be a common occurrence. I am glad to help anyway I can: hotspot@bogueinletnc.com