F100 four stroke fuel starvation issue

[hali285]

i have a pair of f100 four strokes (2000 models). my starboard motor is starving for fuel on the top end, rpm will fluctuate between 3500 and 4000 with 4000 being the most i can get. if the fuel bulb is pumped hard while running the motor runs normal. i have changed filters/ seperators, in line strainer, cleaned pick ups,carbs and pumps. pumps are pumping what appears to be good flow. checked levers that drive pumps from cam, appear good. switched pick up lines from fuel tank and still have starboard problem. also engine is very hard to start cold as if the primers (electronic on carbs) are not working but not sure if an unrelated problem.

[hali285]

thanks for reply just in time. swapped pumps from port engine.. problem remains the same??? do the thermal primers on carbs have any effect on top end fuel delivery? seems that is the only thing left that i have not screwed with...
thanks