Re: 77 mercury 150 won't power up under load
It is not a good idea to run an outboard on carb cleaner because it does not contain the necessary lubricants for the motor (There are carb cleaners for marine motors though). Have someone pump the primer bulb while running to see if the motor rpm raises any. Also, don't run the motor long in this condition because if it is the fuel pump the top cylinders are probably running way too lean.