Also, pick up a stick lighter on the way home if you don't already have one. Weber says not to do it, but you can light the flame with one if you're careful and don't leave the gas on too long beforehand. Just like diagnosing a car ... if nothing else it'll tell you if lack spark or fuel.
And there's another way to test for fuel flow, potentially. You'll hear it when you turn on the gas, if you're hearing's decent and it's quiet outside.