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Author Topic:   40 hp Mariner - Carbs
Toad2001 posted 06-25-2002 03:30 PM ET (US)   Profile for Toad2001   Send Email to Toad2001  
The carbs on my 2 stroke 40 hp 4 cylinder "Magnum" engine seem to be leaking fuel.
When the engine is shut off, and the motor tilted up, fuel pours out of the carb throats until, it seems, the fuel pressure drops off. I have also been experiencing hard starting lately (when hot).
Is there a simple fix to get these two carbs to quit acting up?
Another note: I can get fuel to spray out of the carb when I squeeze the primer bulb in the fuel line...
A sticky float or stuck needle/valve or something??
Thanks,
Bigshot posted 06-25-2002 03:38 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Where does it shoot out from? Find that and you will find your leak. I will assume it is the main fuel line where it connects to the carbs or a bad fuel pump. Normally the bowl gaskets do not leak, especially both. It is hard to start because it is sucking air....not a good thing unless you want a new engine soon.
Toad2001 posted 06-25-2002 04:14 PM ET (US)     Profile for Toad2001  Send Email to Toad2001     
It is leaking right out of the carb "throat"/venturi...
Bigshot posted 06-25-2002 04:25 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
get some Berryman's B-12 from autozone or Wal-Mart and mix it in your gas as directed. It will clear out any smudge. If no dice after about 10 gallons or so, have them looked at.
Clark Roberts posted 06-25-2002 09:11 PM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
Toad, I suspect the float level needle valves! A good cleaning and a gasket and needle valve kit might work wonders... these are very simple carbs .... Happy Whalin'.. Clark... Spruce Creek Navy

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