Hello, first time on the site and though I have a pressing issue I need assistance with, I kinda found myself setting back and reading a lot of posts - date didn't matter - as my interests are right on track with the vast majority.  I do think I am going to receive a lot of excellent and useful info from you all.  Here's my problem:  I have an Ariens self-propelled lawnmower that is approximately 1 year off the lot.  It is a fine machine but yesterday it started and then immediately shut off.  I checked everything possible externally and nothing seems amiss.  I checked the fuel and after replacing  the cap, I cranked it over and it fired right away, ran for appx 2 seconds and died.  The only way I could then start it was by removing the gas cap and replacing it, the end result always being to start and run for two seconds then die.  Any ideas team?  I greatly appreciate any advice, suggestions as I am not all that smooth with the finer points of machinery.  Thank you