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this could be the rush of gas when you turn the gas on , and the gas coming out of the breather hole on the reg try turning it on slower and test for leaks on the reg with soapy water if it bubbles up you have a leak on the reg, then you would have to change it .
What is the noise? Is it gas coming from the tank to the burner? Hissssssssssss Are you properly connected? Is this a OPD equipped tank? Is there a hole or crack in the hose letting the gas out before it gets to the burner?
Do not examine it with a match!!!!!!!!!!!!!!!!!!!!!!!!!!!!
If your tank is very old, you may not have a OPD equipped tank (is the handle three sided?) Yes = OPD No = old style. Only OPD equipped tanks can be filled in the USA. Old style tanks can leak if not properly connected.
New OPD tanks will not let gas out unless there is something properly connected to the tank. You are NOT fooling around with the 80% valve are you? If you are - STOP. (small screw on the right hand side of the connection fitting.)
If there is any fault in the equipment, connector, regularor, hose or any fitting - get it fixed! One gallon of liquid propane becomes more than 350 cubic feet of highly combustible gas. If it leaks out and gets ignited, at least it will be quick! Dont become the entertainment!
Any parts that are questionable ... replace them!
Please seek additional assistance from your professional propane supplier.
The diaphragm inside the regulator is vibrating; that is what is making the noise you are hearing. You could go out and buy a new regulator, but first I want you to try something. What I want you to do the next time you light the grill is to not open the tank valve all the way...only open it about 1 1/2 turns and light the grill. If the noise goes away (which, most likely, it will) then the easiest way to correct it is just to not open the valve all the way. Normally, all one needs to do is open the valve halfway and the grill will get plenty enough gas to give you a really hot cooking area.
What they are hearing is the regulator. There is a diaphragm in the regulator that is vibrating due to the rush of gas flowing through it. This is easily corrected. First, the next time you light the grill, turn the tank valve only one quarter to one half of a turn and light the grill, once the grill is lit, if you have trouble bringing the grill to the temperature you want, you can open the tank valve more and the noise shouldn't start. The reason the noise won't start then is because by that time, the regulator's diaphragm is at the temperature of the gas flowing through it and, subsequently, will not vibrate. If the noise starts again, you can go to just about any home improvement store and get a replacement regulator.
First make sure everything is tight on the valves if you still smell it get some windex spray where you hoses, the tank where it connects places where the propane gone if it bubbles you have a leak for the noise turn the tank upside down and shake it for about 10 second
Check the propane regulator if equipped
Check the gas orifices - they may be carboned up and require cleaning
Check the venturi tubes (the tubes that go over the gas jets) - they may have spider webs or other insect cocoons in them
Make sure the gas valves work correctly (high/low)
You mentioned that you replaced the burners - are they correct for the unit and installed ok?
Make sure the gas valve on the propane tank is opened all the way
This is on the Weber site, under support. I have been experiencing the same problem and have not used it because of it.
Humming or whistling from the regulator: Outside temperature, humidity, barometric pressure, and the gas level within the tank may cause the rubber diaphragm inside the regulator to vibrate, making a humming or whistling sound. Although this sound may be alarming, this is NOT dangerous as long as it is not accompanied by the smell of gas. If the humming sound persists, a change in atmospheric conditions will eventually stop the vibration.