butterflies in carbs

[rideordie]

i have a 90 mercury inline 6 1982 year model believe. it has 3 carbs and the top carb butterfly opens correctly but the second one opens up bout 80% and the 3rd opens bout 60% how would you sujest to adjust the bottom two to open correctly? and when i run my boat fullthrottle for bout a minute it starts shuting down like it running out of fuel could it be fuel pump?:confused:

[rideordie]

would it be best to do away with factory fuel pump and run a electric one?

[RogerH]

I believe those motors had connectors between the carbs that are held in place by a 5/16 head 10-32 bolt. It sounds like the center and bottom carb have loosened and are out of adjustment. They are all driven from the top carb, so hold the throttle open and adjust the two carb throttle connectors, center first , then the bottom.

As far as the fuel pump goes, they should be fine for that motor. The ethenol in the fuel isn't kind to the older motors and I suspect you need to clean out the system.
Hope this helps. - Roger

[rideordie]

thanks man ill try that. o and is there any particular fuel pump i should run on it?