1993 Mercury 25hp 2-stroke outboard leaks gas out of vent hole on integrated carb?

Nealbopper

Recruit
Joined
Jun 18, 2025
Messages
1
Hello all. I bought a used Smoker Craft with the merc 25hp 2-stroke. I rebuilt the carb with rebuild kit. No issues, I watched a boat load of rebuild videos. When I was done and had the outboard back together I primed the Ned fuel bulb and gas was shooting out of the integrated fuel pump vent hole. Why is that happening? What should I do to fix that? Thank you in advance. Neal
 

flyingscott

Fleet Admiral
Joined
Apr 8, 2014
Messages
8,179
Fuel pump or Primer? If its the primer replace the diaphragm. If its the pump side make sure you used the correct gaskets.
 
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