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Mend Briggs & Stratton 283707 Carburetor Lawn Mower Engine

12HP Briggs and Stratton Model 283707 Type 0217 01 carb floods?

When attempting to start, the carb and air cleaner assembly floods with gas passed from engine through the breather tube. (Fresh gas, new line and filter, cleaned carb, new plug with good spark.) Any suggestions on a fix appreciated.

Steve
May 2012

Briggs & Stratton Briggs & Stratton 283707 Garden Tools, Lawn Mowers Carburetor Lawn Mower Engine

The breather tube connects with the crankcase, so if there's fuel coming out of it, the CRANKCASE IS FULL OF FUEL - STOP trying to start it until it's sorted - there is a substantial risk of explosion or serious fire. (Please take this seriously - not a joke - it happened to me and I was lucky to walk away).

This is usually caused by a ruptured diaphragm in the fuel pump, allowing fuel to be drawn directly from the tank into the crankcase via the vacuum tube that powers the pump.

If there is no fuel pump fitted, the the cause will be a leaky carb inlet needle, allowing fuel to fill the engine via the inlet manifold while at rest.

Fortunately, the fuel pump, or a carb kit, is only a few $$$, but drain and refill with oil before starting.

Good luck!

phil(saunders(a)bigfoot.com

Phil Saunders
May 2012