Low flame. less than 1/4
After you disconnect the hose from the tank, wait 5 minutes before reconnecting it. Then turn the tank valve ON VERY, VERY SLOWLY (slow motion, slow). Once the valve is fully open. Light the burner and turn it to it's highest setting. Did the flame height return to normal? I f so, problem solved. If it didn't remove and clean the burner and the venturi valve, Spiders like to build nest in them. If after all of this, the flame height still hasn't returned to normal and you're sure you have a good amount of gas in the tank. You'll need to replace the grill's hose/regulator assembly. You can find one at any home center or hardware store that sell gas grills and accessories. Take you old one with you for comparison purposes.
Hope this time, Your problem was solved. Happy Grilling!!
Weber Baby Q...
on May 15, 2015