I did end up replacing the vaporizer after finding the diaphragm was blown and it was full of silicone. I can still hear propane down at the mixer inlet with the intake tube off but doesn't seem to be as bad. Am I supposed to hear propane at the mixer with the key on? I think the diaphragm on the mixer is blown but both the diaphragm and the mixer are not available. What mixer can I get that will work with this system without replacing the entire system? Thanks