Catfishgetter
New member
I have a 25 hp mariner that cuts back and stops at full throttle. I took off the engine cover and noticed the bowl on the filter would fill up and stay full at low rpms, but at high rpms the bowl went below half full. I started pumping primer bulb to get motor to run at full throttle. Is this fuel pump or maybe giaphragm ? How can I determine what to replace?