I recently purchased a 2005 mercury 4 Stroke (carb). I have replaced the fuel line completely (from tank to motor) and added a water/fuel separator. Running it on the hose, it runs fine (idle & will take throttle). When i put it in the lake (water), it acts as if it?s starving for fuel. From 1000 rpm's to 2000 rpm's it bogs and acts as if it won't take the throttle. I can nurse it past this point and it runs fine for a few seconds then acts again as if its starving for fuel. I can pump the primer ball and it runs fine (as long as i pump the primer ball every so often. Please help. I have ran it straight from the tank (bypassing the water/fuel separator) and it does the same thing. Carbs were rebuilt 3 weeks ago by Marina and i have been running Fuel treatment. Pickup in tank has been replaced along with cleaning tank and fresh fuel.
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