I have a 1990 artic cat 440 jag afs. my wife was riding it an it sounded like it ran out of gas,but it didn't. It has spark but it still does not fire if i spray starting fluid down the cylinder, i thought maybe the gas had ice or water in it o i put deicer in the tank. that did not work, so then i pulled the fuel lines off and blew through them, it felt restricted at first then the gas started to free flow. when ever I turn the engine over I see the gas move throough the fuel lines so I dont think that the fuel pumps are bad, but I guess if they are whrer are they located on the sled, and, is there anything else that mioght cause it not to start?