The pressure regulator makes a loud hissing sound. the grill is more than ten years old.
I've been in the propane business 28 years and have found regulators from the 1950's still in use today. Regulator manufacturers tell us they should be replaced after 25 years. It should typically outlast the grill itself, which often require new burners, cooking grids, etc. The hissing sound can just be the flow of gas thru the regulator. If you smell gas however, then you should replace it. If it is affecting the pressure to the burners and not getting hot enough to cook properly, then replace it as well.
Testimonial: "Thank you, Douglas."
If you smell gas you should first do a leak test. Just because you smell gas doesn't necessarily mean it's the regulator. If there is a gas leak by the black knob that hooks up to the tank, it's the tank. There is a rubber seal inside the mouth of the tank valve that creates a seal when the brass nipple of the regulator comes in contact with the valve. That seal wears out, dries up, cracks etc...
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