Smitty Two wrote:

What "tanks" you be talking about? The manual you linked to was for
a natural gas grill.

My mistake. Here is the correct manual:

http://weber.com/help/manuals/pdf_fi...478_092409.pdf

There are many more references to a "regulator", but the most useful
appear in the troubleshooting section on page 17:

---------------
Symptoms:
Burners do not light. -or- Burners have a small flickering flame in the
HI position. -or- Barbecue temperature only reaches 250 to 300 in the HI
position.

Check:
The excess flow safety device, which is part of the barbecue to cylinder
connection, may have activated.

Cu
To reset the excess flow safety device turn all burner control knobs and
the cylinder valve off. Disconnect the regulator from the cylinder. Turn
burner control knobs to “HI”. Wait at least 1 minute. Turn burner
control knobs to “OFF”. Reconnect the regulator to the cylinder. Turn
cylinder valve on slowly. Refer to “Lighting Instructions”.
---------------

This is a pain in the ass when it becomes the default or standard way
that the grill has to be operated all the time.

Does anyone else have this problem with their Weber grill?

See also:

http://www.dslreports.com/forum/r203...Grill-Problems

---------------
Since 1995 all regulators (the part that attaches to the gas tank to
regulate the flow of gas) have included a safety device that restricts
the flow of gas in the event of a gas leak. This safety device can be
inadvertently activated in two ways, putting the grill into what is
commonly called “bypass”. The first way for the device to be activated
is to leave one or more burner control knobs in the “ON” position when
the LP cylinder valve is opened. The second is not to wait long enough
to “start” the grill after opening the LP cylinder valve. The safety
device in the regulator is activated each time that the LP cylinder
valve is opened. The device resets itself when the gas pressure
equalizes between the closed burner control valve and the regulator,
through the hose. If a burner control knob is turned on before the gas
pressure can equalize, the device will remain in “bypass”. The length of
time necessary to wait to “start” the grill after turning on the LP
cylinder valve is dependent on the length of the hose and outside air
temperature. It is always good practice to wait a few seconds after
opening the LP cylinder valve before turning on the burner control knob
to start the grill.
---------------

Also

--------------
My weber grill did this about a year after buying it. Contacted them via
email support, explained I tried all their troubleshooting, and they
sent out a new regulator, hose and manifold which did the trick.
--------------

So it looks like I'm going to contact Weber and get a new regulator.
The best I've seen it do is to get to 450f in 15 minutes - not 500f in 2
minutes.