First and simplest check to do is make sure tank has fuel in it and that the tank coupler is tight...also make sure that the tank couplermis fully seated,have seen alot of times after a tank change,the one oring gets caught in the coupler then transfers to new tank,now there is two flat orings and couple dosent seat correctly,causing a no start,low fule condition.....also make aure tank is oriented right in its cradle and that the valve is opened fully....