Mercury 25 hp 1999 2 stroke no top end

[jbyleroh]

I have a 1999 mercury 25 hp 2 stroke that starts right up (electric start ) runs nice up to about 1/4 throttle then it just bogs down with no power .I've cleaned the carb ,new plug and fresh gas but with no success . Is there a high speed screw on the carb that need adjusted of is this coil or electrical problem .It idles fine.

[boats.net]

Try a new fuel hose and different gas tank if have one.

[JUST-IN-TIME]

if it runs on new tank and hose, then you know the problem is on the boat not motor

sounds like fuel pump