1891 Mercury 25 fuel system problems

markn

Recruit
Joined
Aug 7, 2004
Messages
3
MOtor has 250 hrs on it. I recently replaced everything from the gas in the tank to rebuiolding the carb with a new gasket set. The motor will start whin I squirt gas down the carb throat and hold the throttle open manually. It will run at a high idle until it starves itself out of fuel. I am convinced that the carb cannot be the issue. A compression check weas fine. WHat other isues can there be?
 

ronmold

Petty Officer 1st Class
Joined
Sep 8, 2003
Messages
240
Re: 1891 Mercury 25 fuel system problems

Wow! now that's an old motor! But seriously will the motor run if you keep pumpin' the fuel hose bulb? Is the bulb in the right way?
 

GMCAMARO

Cadet
Joined
May 27, 2003
Messages
28
Re: 1891 Mercury 25 fuel system problems

After you pump the fuel down the carb throat, and hold the throttle plate open and let it warm up, yes it will stay running, but as soon as you try to let it idle, it bogs down. Trying to restart it is a real effort. Putting more fuel down the carb throat does not start the engine right of way.
 

ronmold

Petty Officer 1st Class
Joined
Sep 8, 2003
Messages
240
Re: 1891 Mercury 25 fuel system problems

sounds like fuel pump, easy & cheap to rebuild.
 

GMCAMARO

Cadet
Joined
May 27, 2003
Messages
28
Re: 1891 Mercury 25 fuel system problems

We rebuilt the fuel pump several times, we followed the directions, well, and yet the results where the same each time.
 

GMCAMARO

Cadet
Joined
May 27, 2003
Messages
28
Re: 1891 Mercury 25 fuel system problems

Originally posted by DasBoat:<br /> Wow! now that's an old motor! But seriously will the motor run if you keep pumpin' the fuel hose bulb? Is the bulb in the right way?<br />
Yes I checked the arrows and that was not the problem, if you continued to pump the bulb, the bulb just got hard.
 
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