Mercruiser 305,5.0LX Carb. loading up

pef

pef

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Dec 12, 2010
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I have a 1990 Mercruiser 305, 5.0 LX Sea Ray with a Roch. 2BBL. Fuel is flooding into the engine. The carb was factory rebuilt and not run yet. I Can hear something running even with the key off and the battery selector switch turned off. Would appreciate any advice on this.
Thanks,
PEF
 
Bondo

Bondo

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Re: Mercruiser 305,5.0LX Carb. loading up

I Can hear something running even with the key off and the battery selector switch turned off.
Click to expand...

Ayuh,... With the power Off,.. Nothing should be running,...
Follow the Sound to see what it is....

What's the fuel Pressure at the carb's inlet,..??
 
Don S

Don S

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Aug 31, 2004
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Re: Mercruiser 305,5.0LX Carb. loading up

Do you have an electric fuel pump? The 1990 model should be a mechanical pump.
 
A

Aloysius

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Aug 21, 2010
Messages
484
Re: Mercruiser 305,5.0LX Carb. loading up

There's only 2 things that cause a carb to flood..needle and seat leaking, or excessive fuel pressure.

A carburetor is just like the tank on a toilet!
 
cr2k

cr2k

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Mar 19, 2009
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Re: Mercruiser 305,5.0LX Carb. loading up

3 not 2....If the tiny vent holes (on top of main jet venturis) are plugged fuel will siphon in to the throat.....DO NOT use tip cleaner to clean. Soft metal or stiff fibers.
Any change in the size of this orifice will dramatically change how the engine runs.
 
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