I wonder if they have the air adjusted correctly? I know on mine it has done that in the pass, (popping) but after I adjusted it, it's fine now.
As far as the gas line getting hot, I guess I've never checked that. I sure wouldn't think that is normal. Maybe talk to the service manager at your dealer and see what he has to say about it. They might have to adjust the air mixture, and that just might be the problem.
2008 Cruiser CF26RK
2013 Ford Eco-Boost
Heavy duty payload - Max tow
135 Watt Solar Panel