hello i just took my gst to the park today cause it was a nice day out after sitting for 6 or more months. it started up after a few turns of the roto starter but after 10-15 mins it just died out and stalled on me. i brought it back to where my stuff is and tried to start it again but nothing was happening. i changed glow plugs and drained the fuel from the egine and reprimed it. still nothing was ahppening. what can that be from?