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Likely his was leaking through the vacuum line to the carb.. The "This Fits" is the most common valve for gravity fed systems.. As it is labeled the middle is off . Top is on main and bottom is the reserve. The faulty valve only opens the main under vacuum.. The reserve opens whether there is vacuum or not.. Yes the no vacuum valve will work and give you both the main and reserve as dsigned.. TRhe vacuum operated valve depends on the fuel in the carb bowl to start and open the line.. If there is no vacuum the motor would die as soon as the carb bowl emptied.1 point
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I have had models of Arctic Cats that used that type of fuel valve. They were gravity fed fuel systems. I have had this valve go bad and had to replace it. Flooding the carb and intake is usually the float in the carb not working properly.1 point
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What you have is a vacuum operated petcock in the prime position the fuel flows freely it the on position engine needs to be running pulling a vacum for fuel to flow.As they age the vacuum parts get hard and dont work well. The last problem i had with one it wouldnt run on on but would run on prime ran it for a while that way and finally replaced it. As far as the fuel getting into the cylinder it sounds like the fuel is leaking past the needle and seat or float level not correct i would check that, now it could be getting in through the vacuum hose if the diaphragm in the petcock is cracked.1 point
