boat carburetor problems?

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I have a boat with a 3.0 mercruiser engine. Sometimes when i try to start the boat it will not start. i think it has something to do with the carburetor but im not really sure. I have to open the flame arrestor and hold the flap down to get it started then it will work fine. What do you think is the problem and what can i do to fix it??

Thank you,
Norman
 
Sounds like your choke mechanism isn't working properly.With engine cold flap should be closed,if not closed adjust by turning choke spring housing until flap just closes (no further)
 
The flap that you hold open allows air in to the engine. If the engine is cold, you want a higher fuel to air ratio. In some cases it you disconnect the gear shift, and pump the throttle 2-3 times you squirt fuel directly into the intake. However, if the engine is warm (sometimes 2 hours or more after it was last running) you need a higher air to fuel ratio. When you open the "flap"that's what your doing. Old timers would talk about flooding. So, if your pumping the throttle like with a cold engine, don't. Also the choke mech. may be holding the flap closed and not allowing it to open. The final thing, and least often the cause of hard "restart" is the spring that opens the "flap" is too loose or not working freely. A good service manual can walk you through the adjustments. So, using this information try to narrow down just exactly what's happening. there is a possibility that the carb needs cleaning and adjustment. Good luck!
 
If your boat has been stored for awhile the gas may have crystallized in the pilot and main jets in the carb. It happens a lot. Open the float bowl remove the jets clean them (I use torch cleaning wire,but you must be careful not to remove any metal(usually brass) from the jets. Then a good shot of compressed air into the holes in the jets.Replace jets, do not over tighten. Replace float bowl.
 
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