I have this Sabre 38 inch deck that lost power while mowing lawn.I started it but engine just stalls.Only time it will start is if i spray carb cleaner but only for a few seconds.. What i did was, change the fuel filter,spark plug,dismantle blow and clean carb,clean air filter (still good),change oil, check fuel line.. (guess, no fuel pump only works with gravity)gas continues to flow. I'm stumped! It takes $40 per cut. Now, battery is almost dead after trying to start it.If i jump start it .. same thing will start only if i put on carb fluid.. help needed before i sent my mower to repair shop.