www.iFourWinns.com

I have a 1993 four winns 180 horizon. it has the 5.0 mercruiser. do to business i havent had it in the water for 3 years. i cant get it to idle. i have replaced the plugs,cleaned all the internal distributer parts. the back fuel pressure valve seems to have alot more pressure than the front valve. any ideas?

Are you running the engine with gas that has been in the tank for 3 years?

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'99 258 Vista Cool Breeze II

lol no

Carb could be internally varnished?

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2011 Four Winns H180 SS.
Aussie built Mustang 2800.
SOLD - 1997 Four Winns Horizon RS

Do these engines have an Idle air control valve - on my Sundancer it was nearly a once a year event.

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2010 Vista 338 Volvo Penta
2005 Yamaha Wave Runner FX HO

2005 SeaRay 280 SunDancer
2001 SeaRay 245 Weekender

On an old carb engine it could be many things:
vaccum leak -->bad carb to manifold gasket
clogged idle circuit in the carb-->carb needs thorough cleaning
float setting off, if too high it will cause the engine to flood

I'd recommend finding a place that rebuilds marine carbs and let them try to re-do yours. If it works, great if not then consider buying a re-man carb, if you can find a reliable vendor. I've had my 1988 Rochester Quadrajet re-built 2x in the years I've had it (since 2002)....

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88 Four Winns 200 Horizon
4.3 OMC Cobra-4bbl
2002 Walker Bay 10/2012 Suzuki 2.5
2008 Walker Bay 8

1998 Jeep Grand Cherokee 4.0/Selectrac
2007 Jeep Grand Cherokee 5.7 Hemi/Quadradrive II