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 12.5 PH B&S Puking gas

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D.U.B.S.
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PostSubject: 12.5 PH B&S Puking gas   12.5 PH B&S Puking gas Icon_minitimeSun Apr 14, 2013 7:35 pm

Hi,
I have a 12.5 HP B&S engine. I decided to replace the fuel hose and filter. I did so, and put some gas into it, and then, BOOM!!! Gas starts to puke out of the exhaust port (I have no muffler on it) when I try to turn it over. Am I correct to assume that the float in the carb is not seating? It is sitting in my yard leaking gas out of the exhaust right now.
Thanks
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Chopperhed
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PostSubject: Re: 12.5 PH B&S Puking gas   12.5 PH B&S Puking gas Icon_minitimeSun Apr 14, 2013 7:39 pm

yup
shut off the gas line or pinch with vice grips
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PostSubject: Re: 12.5 PH B&S Puking gas   12.5 PH B&S Puking gas Icon_minitimeSun Apr 14, 2013 7:42 pm

Get a fuel shutoff valve. You should have one on everything without a pump.

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PostSubject: Re: 12.5 PH B&S Puking gas   12.5 PH B&S Puking gas Icon_minitimeWed Apr 24, 2013 7:11 pm

Have you solved this yet?

If not, look to the float needle and seat in the carb. Odds are good it's not sealing, and flooding the cylinder. A shutoff is a good idea, and should be used even with the problem fixed.

And remember- If the above WAS the problem- change your oil immediately! The fuel gets past the rings and into the crankcase pretty quickly.

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12.5 PH B&S Puking gas Empty
PostSubject: Re: 12.5 PH B&S Puking gas   12.5 PH B&S Puking gas Icon_minitimeWed Apr 24, 2013 8:18 pm

yup, what he said
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PostSubject: Re: 12.5 PH B&S Puking gas   12.5 PH B&S Puking gas Icon_minitimeMon Jun 10, 2013 11:44 am

I have not tried to fix it yet, I am thinking of replacing that motor with a 19 HP engine. The 12.5 has no exhaust, and it has turned the carb black. It has not run right since I got it. I might swap it.
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PostSubject: Re: 12.5 PH B&S Puking gas   12.5 PH B&S Puking gas Icon_minitimeMon Jun 10, 2013 11:54 am

there is 1 more thing to consider, although far less likely. Your throttle 'butterfly' is not closing down at low throttle positions, thus letting fuel through in volume. I had a craftsman powered by a kohler 13 ohv do this, only to find out after everything else something was jammed into the carb and had prevented the valve from closing properly.

Still, I believe the needle and seat may be the problem as well... just the above commentary should be considered...
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12.5 PH B&S Puking gas Empty
PostSubject: Re: 12.5 PH B&S Puking gas   12.5 PH B&S Puking gas Icon_minitime

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