Not 100% how far it is from the mains. I was running it from the gas bayonet for the BBQ, which has around 12 foot of piping running around the BBQ area and into the brick wall and the gas meter is on the opposite side of the house. So maybe at least 50 foot from the meter???
So you think the prob is not enough gas pressure??
It is one possibility. I spoke with two different plumbers before installing my run + bayonet and was told it would never work - that I'd never have adequate pressure to maintain the burner let alone crank it right up. My run sounds very similar to yours (in length) but I gather there are many variables from street to street, house to house.
Try this, which may shed light on overall pressure: Light the mongolian and get it as stable as possible (with whatever jets are firing) then have another person in the house light your gas stove (fingers crossed you have a gas stove!) and turn the largest burner up all the way. If lighting the stove kills the mongolian, you probably don't have enough pressure in the system
If lighting the house stove (or using other gas appliances) has no effect, you're probably good to go and I'd guess it's a regulator, jet, air-flow issue
in that order. FWIW, I can run my mongolian full guns with all gas burners on high on house stove, etc. without issue.
The reg I'm using runs a four burner BBQ plus wok burner fine and I also use the BBQ wok burner on it's own (drilled out a bit) to do single batches in my 40l pot. It's just a little underpowered and were looking for more grunt.
The G&G mongolian I use is
here Not a lot of information but the jets are the correct size for NG, no modification was required. I spoke with both the manufacturer (a Vietnamese girl here in Melbourne) and the gas specialist at
BBQs Plus Spotswood who both recommended the regulator I'm using. And I purchased from BBQs plus $25 or $30 from memory.
So, if pressure test above is OK, get the correct reg and see if it resolves. If not, next restore the jets to stock (with correct reg) and see if it resolves and work backward plugging 1 jet at a time to retest until you are satisfied with the throw. Final note, these mongolians require a ton of air from beneath the jets so be sure to set it on something with adequate under air-flow. Pic of mine (disregard tape measure - was used to demonstrate length from top of jet to kettle bottom). My burner sits on sheets of powder coated, perforated ss sheeting:
Best of luck
reVox