Originally Posted by Stevegd007
But if you have turned off the gas at the tank. You will most likely have NO gas in your line & will need to purge Air from the line to be able to light.
NO air in line to purge.........
It's just simple fact that LP Regulator is closed due to lack of demand.
You just need to 'establish' flow by placing a demand on regulator.
That can take a few attempts depending on source of demand.
Fridge....low demand at most 2200 btu
Water heater......bit higher 10,000 btu
Furnace............can be as high as 40,000btu
But the above three have 'flame proofing' feature that has to occur within first 10 seconds of attempting to fire off......otherwise after 3 attempts 'lock-out'
That is why after a period of non use the stove top burners on high is easiest and quickest way to 'establish' flow and place 'demand' on LP Regulator.
Stove top....typically 2 burners at 5,000/6,000 btu and 1 at 9,000 btu.
All three on HIGH....19,000/21,000 btu demand and no flame proofing/lock outs
Turn one on...let it go until it lights off then light off the other 2.
Flow established and regulator in service due to demand.
But pressure is only 0.4psi (11" WC) so it can take a little bit to run full length of propane line.
But no air to purge......