Carb trouble???

[Bonefisher15]

I have a 1999 90 HP Yamaha. When running the boat, my rpms have been dropping and then picking back up. I put the boat in garage and started pummping the fuel ball to see if it would stay hard. As I was doing this, gas started pouring out of the prop. I'm not very mechanically inclined, but I have a friend who is and wanted to give him some insight before he looked at the motor. I am thinking a carb problem. Wondering if anyone has had an issue like this and has a possible solution?? Also, when flushing motor with the hose adapter, is it ok to turn the motor on like if you were using the ear muffs??

[jb123]

check to see if it indeed ran out of prop exhaust or ran down midsection from carb overflow. if it has been a while you should definately clean your carbs.

[Bonefisher15]

It's leaking from the prop exhaust, what do you think the problem could be??

[Ken]

Bonefisher,
Ruptured diaphram in the fuel pump, I believe, would cause fuel to come out the prop exhaust when you pump the bulb.
Ken K [img]smile.gif[/img]

[Bonefisher15]

Where is the fuel pump located and if it is a diaphragm problem, is it an easy fix??

[Bonefisher15]

Where is the fuel pump located and if it is a diaphragm problem, is it an easy fix??

[Hamfisted]

Post your email and I'll send you a service manual for it.


Mike

[Bonefisher15]

Already fixed the problem. Put the new fuel pump in and the ball stays hard now. I wish all fixes were that easy. I appreciate everyones help!