Suitable pressure of the propane supply is absolutely essential to proper operation, which is why it is remarkable that almost none of have a manometer to directly check it. I checked the price of the common manometer kit (sold by RV parts stores), and found it was something like Cdn$180... so now I know why we don't have them!
Originally Posted by DeadEyeDan
Smell gone too, smell must have been something else.
The vent on a propane regulator should ideally just let air in and out to the non-propane side of a diaphragm, to provide a reference for pressure control. It seems that when regulators have problems they can vent propane, or sometimes just liquid contaminants from the propane. This may have been the source of the smell.