Can anyone help? My engine will not even hand crank forward. I have to hand crank it in reverse approx 90 degrees,then forward the same amt. After repeating this aprox 10 times I can hear what sounds like water burping through the engine. Once I do this the engine will then start. After stopping the engine I then hear fluid draining back into the engine from what sounds like the muffler from the exhaust hose. I am baffled? Any thoughts would be greatly appreciated. Thanx.