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How to rebuild a 15hp mercury outboard carburetors

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Remove and dismantle remove any jets and needle and seat. spray with carb cleaner ,blow out with compressed air, replace needle and seat if worn, make sure all jets are free of any blockage, assemble and refit.

Posted on Dec 03, 2016

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Take them apart and note the position of every part, clean the carbs with spray carb cleaner and then blow out all the passages with compressed air. Do not dip to clean the carbs, do not adjust the mixture screw.

Posted on Dec 03, 2016

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Posted on Jan 02, 2017

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How to Clean an Outboard Carburetor?

didnt specify unit --generic answer --best way is to buy a rebuild kit [should have instructions]--carb cleaner --disconnect carb --and tear down the carb becareful their are small parts inside using cleaner cleal all parts and housing --in the rebuild kit should be instructions on putting it back together
15 minute Carburetor Cleaning Rebuild Yamaha 20HP outboard 4 stroke How to Clean an Outboard Carburetor Outboard Motor Carburetor Cleaning

Oct 20, 2016 | Boating

1 Answer

Gas flowing out of the top of carb. this is a 9.9 mercury 4 stroke outboard motor.

this can happen when the float in the float chamber of the carb. jams or "grot" gets in the way of the seal that pressure from the float should create to stop fuel entering the carb. An easy fix, if this is the cause. Unscrew the float chamber be, careful of the gasket, and clean inside, check float for freedom of movement. I prefer paper/fibre gaskets. Good to keep a spare in your kit.
Hope the above was of help.

Feb 28, 2016 | Mercury Marine 15hp & 20hp 4 Stroke...

1 Answer

Fuel connector is broken on the engine

sorry but you might have to take it to a mercury dealer .

Oct 15, 2015 | Mercury Marine 15hp & 20hp 4 Stroke...

1 Answer

Are the controls for a 1998 15 HP 2 stroke Mercury outboard compatible with a 2011 30 HP 4 stroke Mercury outboard

If your old engine/control has the same 'options' as the30hp, yes everything is compatible... (Electric start or trim )
The throttle and shift cables are allways compatible...

Jun 25, 2015 | Mercury Marine 15hp & 20hp 4 Stroke...

2 Answers

Not much of a mechanic....20hp mercury 4 stroke...when I squeeze the ball on the fuel line it pressures up when not attached to motor...when attached it doesn't...motor burns only fuel in line and die

First, the female connector has a check valve in it which is why the proper bulb gets hard when not attached. When you attach to the motor the male end opens the check valve, releasing some pressure to the carburetor. If the carburetor float is old, worn or not serviced, you are essentially squeezing fuel directly into the cylinder flooding the motor. An easy way to see this is to remove a spark plug, pressurize the system, crank it over and a bunch of fuel will pour out the cylinder.
Another possible issue is an air leak. Not being able to keep pressure in the fuel system can cause the fuel lines to aspirate (sucking air) not allowing any fuel to the carburetor at all. But you should notice a fuel leak somewhere between the connection at the motor and the carburetor. Pressurize the system and analyze all fuel lines. Look for leaks. When you check your spark plugs, after the above steps, if they are wet and smell of fuel, chances are high you need a carb rebuild kit or a float rebuild at the very least. Extremely easy to do yourself when with minimal skills. My best guess is something, either dirt or fuel corrosion is keeping the float open flooding the motor as this is most common. Also, another possible and likely situation is a bad fuel line anywhere in the system. You can test the line from the tank to primer bulb by pressurizing it unhooked from the motor and inserting a device into the end of the connection to release pressure. Fuel will spray out so be careful. On the motor, if you don't see gray fuel lines, chances are they are collapsed on the inside (which has happened to the tank to engine line on one of my boat) because of using ethonol fuel. If lines anywhere in the fuel system haven't been changed in a few years, I would honestly start there as you should have ethonol rated lines to begin with. After fuel lines are replaced, work from tank to carburetor diagnosing the above suggestions. Fuel systems are easy to work on but without actually seeing what's going on, hard to diagnose. If all the above are in order and still not starting, time to start diagnosing your electrical system. Good luck!

Aug 27, 2014 | Mercury Marine 15hp & 20hp 4 Stroke...

1 Answer


I see it as a 6M from 1986 in the mercury listings...

Jul 27, 2014 | Mercury Marine 15hp & 20hp 4 Stroke...

1 Answer

2001 mercury 4 stroke outboard filling up with gas..

Carburetor float bowl stuck. Take apart carburetor and rebuild it or swap it out for a rebuilt one.

May 26, 2014 | Boating

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