[SublimeMasterJW]

Here is how I would do it. Be careful. I would remove the 2 wires going to that flame sensor. I would get the dryer going on cotton cycle. I would touch them 2 wires together and see if that glow bar comes on. I would wait about 3 minutes and then seperate them wires to shut down the ignitor. The gas should ignite then and you can observe it for a moment holding 2 hot wires in your hand and wondering how you are gonna drop one of them and disconnect the dryer without shorting something out and getting blown to kingdom come. It is way better to have the wife or a witness to be around just so they can unplug the dryer for you. When I check one of these dudes in my shop on my appliance lift, I have the cord real close so when the test is over I just shut down the dryer. Trying to do it at home around a bunch of piled up dirty laundry in a hot utility room all alone may tend to be a problem. Be careful. If the appliance regulator is faulty you will not get any flame You say you have replaced the coils and paid the gas bill. So the regulator is what I am leaning towards. If the regulator is ok and the assembly works with this test then you have either a faulty thermstat like you pictured or it is in the timer itself. As far as the new fangled tank, have you got a grill tank you can hook up to the dryer to prove your theory? Just a thought.