hi all, i just finished hooking up my propane grill to the line coming into my home. i'm using 1/2 black pipe about 20' run then reduced to 1/4" gas which is on the grill regulator. When i turned on the gas and waited a while it is burning very very low, like when your almost out of gas when you use the 20# cylinder.. any ideas how to fix it? again, this is coming ultimatly from my 500# which is 50% full.. 