12.5 PH B&S Puking gas

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

yup
shut off the gas line or pinch with vice grips

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

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.

yup, what he said

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.

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...