I have a Scag Tiger Cub with 21 hp Kawi and 48 inch deck. It is my back up mower and it has approx 1950 hrs. Today i went to the garage to service the machines and all of the started but the scag. I changed the plugs and cleaned the air filter and still it wont run. The motor does crank. If i spray started fluid into the air box the mower will run for a second and then die. I assume this means that the engine is not getting fuel? Maybe the fuel pump is bad? if anybody can offer me any guidance on fixing this problem i would appreciate it. The mower ran perfect when i parked it last fall.