1994 Yamaha 25 hp OB

jzaleski2

Recruit
Joined
May 28, 2013
Messages
1
Fuel supply issue to the carb, must use manual choke to start after short stops, and engine wont run after 1/4 tank of gas is left in it. No visible leaks in hoses or gas smells. Motor runs at full speed to idle, but has the above symptoms.

1. the primer bulb is always mushy, will not get hard.

2. fuel level inside the fuel filter goes up and down while squeezing the bulb.

3. replaced the fuel tank pickup, has a clean screen.

4. ordered a fuel pump, plan on installing it.

5. Fuel filter is clean.

6. Ran high concentration of sea foam in gas to clean system, no improvement.
 

99yam40

Fleet Admiral
Joined
Sep 7, 2008
Messages
8,851
Re: 1994 Yamaha 25 hp OB

Sounds like it is sucking air from some where, check all connections and o-rings.
My 1st thought was cracked pick up tube but you said you already replaced that

Fuel pump could help, but you should be able to open it up and inspect it or test pressure/vacuum to see if it is working properly.
Look in the frequently asked question part of forum for testing procedures
 
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