1986 mercury 90 hp inline 6 boggs out

Merc 86 inline 6 bogs out when you give. It gas. Runs fine when you give
Throttle and my friend squeezes the primer fuel bulb.
Any answers solutions would be great thanks Guys I apppreciate all your help

Re: 1986 mercury 90 hp inline 6 boggs out

Sounds like you need to check everything in the fuel system. It could be you need to install a new fuel pump kit check for pin holes in the diaphragm . If ok then check all your filters and check valves. Check all fuel line connections and for cracks in the line. If you have a built in tank check the pickup tube and the vent line. If you have a 5 gal plastic tank make sure the vent is open. Good luck.

Re: 1986 mercury 90 hp inline 6 boggs out

Your friend is acting like a fuel pump when pumping the primer.

Either the fuel pump needs rebuild or the O-ring in the fuel connector to the motor is leaking and allowing the pump to suck air into the system enough that the motor can't get enough fuel.

An easy method to check, Temporarily install a clear plastic hose between the fuel pump and carbs, start the motor and watch for any air bubbles passing thru which would prove air sucking into the system somewhere between the fuel pump and tank.

Remove the clear hose once finished with repairs as it is NOT rated, and should not be left on the motor.

Also test fuel pump by disconnecting the fuel hose to the carbs, point it into a suitable container, crank the motor for a few seconds witih the lanyard pulled. You do not need to start the motor, simply observe the fuel stream to check fuel pump output, it should be s strong solid pulsed stream. Any less and the motor will not receive enough fuel to make good power.

Re: 1986 mercury 90 hp inline 6 boggs out

Thanks lone duck & Charlie B
Great advice will try and. Post