Thats a pressure line not a Vacuum line. Just make sure the hose isn't pushed more than 1/4 inch into the tuned pipe. If you are still having proble,s getting it started and running, you may have a bad Glow plug. Check the plug coil to see if it is deformed or if it has carbon build up on it. 3 of us had this problem today at the track after retuning for the hot humid day. I had my GP go bad while I was retuning. After getting it right, I shut it down to clip the body back on then it wouldn't start back up. Changed the plug and it was screaming again. :hammer: