I just built an outdoor natural gas fireplace.  After construction I found that the flame gave off hardly any heat.  After checking the gas pressure I found that I have less that 1 pound of pressure not the required 3-7 psi which would explain the low flame.  Is there a way to increase the pressure in the gas line.  Or is there a way to disassemble the gas line under the house to remove unneeded gas pipe, thus increasing the pressure?  All of the appliances in the house are ran off the same gas line but are working optimally (including stove, double sided wall heater, on demand hot water heater)