Leaking fuel from vent hose on bottom of accelerator pump

Joined
May 15, 2019
Messages
1
Hi everybody,
I have a 2008 20HP Merc outboard and I'm having a problem. The only way for the engine to start is to keep the choke pulled out, and having the throttle on the tiller handle at about halfway. As soon as I push the choke in, or return the tiller handle to the "neutral" position, the engine cuts out. Now I've noticed fuel dripping out of the vent hose on the bottom of the accelerator pump. After buying the service manual and doing some research, I have concluded 1) the diaphragm in the accelerator pump is cracked/broken, or 2) the float is stuck, possibly because of the float valve, which is causing the engine to run too rich and die. One more observation. If I push the accelerator plunger down, I can pump fuel out of the vent hose, the one which is leaking fuel in the first place. Any thoughts?
 

GA_Boater

Honorary Moderator Emeritus
Joined
May 24, 2011
Messages
49,038
Welcome aboard.

Most likely it's time for a carb rebuild. Because our boats sit roughly half the year, parts start to dry out and leak.
 
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