Won't start spark plug fires when grounded to frame but is full of gas and falls the sparks plug out. I have changed the oil , oil filter , drained d gas ,instated new gas .still won't start. Found out the supply hose inside the tank had rotted off at the top fixed that , pulled fuel line off at carb raptor turned on key to start and fuel pumped out.rehooked up fuel line . Still won't start . Pulled spark plug it was covered with wet gas.grounded spark plug to frame , turns key and pluged was arming . Turned engin over several times to clear cylinder out ,replaced spark plug with new one .had spark.i tried this 4 times , wet gas on spark plug each time .could use some good help?