I appreciate your reply. In your case, the pinched fuel line was the culprit. I do not have any "kinks" on the line, but following the procedures on Bartron's "code orange" thread to do a partial canirestomy and installing the one way valve has not worked as advertised.
I know that lot's of inmates have done this modification, so my question is: have you just vented to the atmosphere as Barman did, or did you use a one way valve? If you did, how is it working out?