Forget all these other "cures" I have the REAL answer. I have had the same situation with mine. Mr. Heater hose and Weber Q grill. They will work together but not very often. The problem is the pin in the Weber gas fitting is too short to push open the needle valve on the hose. I've had mine work a couple times but only because I've tightened the fitting way too tight and managed to get it to open the valve. Thes two parts do not play well together. Get a hose from the grill dept at Wally World for ten bucks or so and it will solve your problem. I fought with the same combo as you for a couple years before I figured it out..
B.O.
