Nice breakdown of the vacumm operated fuel petcock Tim. This is actually very insightful and will probably be very helpful to some. Think this thread belongs as a sticky.
If you can't fix it, get a bigger hammer
My wife's 03 Vinson 500 sat for 18 months. I finally got around to putting it up for sale and OF COURSE it won't run. Crankcase full of fuel, fuel is entering through the vent hose that runs into the air cleaner housing. Fuel is getting there through the carb, somehow. I got it dried out, and cleaned up the carb, checked float, it floats, needle and seat LOOK good. I think the petcock might be the culprit. Got it started, ran great at idle, and at mid throttle, heavy throttle and the fuel started pouring into air cleaner housing from the carb, also it flooded the motor.
This leads me to think it is the petcock and the issues detailed here. Is it rebuildable? is there a kit, or should I just order a new one? Thank you for the help, Bob
Easy install, inexpensive insurance....installed it between the petcock and carb...
Yeah! I was looking at those fuel shut-off valves last night, I was wondering how reliable they might be being mostly plastic. I also found this one by Motion Pro that I thought looked to me a little better material wise.Easy install, inexpensive insurance.
Briggs & Stratton® Inline Fuel Shut-Off Valve - Tractor Supply Co.