Troubleshooting natural gas line feeding fireplace and outside grill

Old 05-28-24, 08:30 AM
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Troubleshooting natural gas line feeding fireplace and outside grill

Wonder if someone can help with some tips?

Previously, there was a natural gas line feeding an upscale BBQ grill outside the house (from a connection on the far side of house from meter). The grill would get up to 600 deg. easily. It was bought from the manufacturer for Natural Gas, so the orifices are correct?

A few years ago, the grill was moved to the other side of the backyard. A plumber ran a nat. gas line to feed the new grill location and a gas fired fireplace right from the meter.

There's a quick disconnect connection for the grill hose. This is under an outdoor planter box so if the hose is disconnected, the quick disconnect wouldn't gather water (although it is always connected anyway).

The gas line & hoses don't appear to have any kinks. The ball valves are all open fully.

Since around that time, the grill only gets up to 350 deg. The grill has 3 burners. As you turn add'l burners on, the flames get smaller on each burner.

And he doesn't think the flames on the fireplace are as big as he thought it would be.

He's replaced the regulator on the grill. The new one is adjustable and he turned that up. He got the grill to get to 375.

He's replaced the burners in the grill and checked for spider webs.

He turned off the gas valve at the fireplace - to turn off the pilot. ('d think the pilot doesn't use much of any gas / wouldn't change things), There was no change in grill poor performance.

The fireplace and grill are NEVER used at the same time.

These adapters have a taper inside them. These aren't enough to affect an upscale grill?

He has a whole house gas powered generator, so the house has plenty of gas coming into the house?

This is the old regulator:

Is there a pressure meter for gas lines at Home Depot /Lowes?

The fact that he feels the fireplace isn't as big a flame makes it seem like the issue might be closer to the main?

And even if pressure if correct, how do you measure throughput of gas?!

Do you just disconnect everything and check for dirt / too much thread sealant in there? Blow out the lines with an air hose? check / replace all the shutoffs / quick disconnect?
Old 05-28-24, 09:22 AM
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You have the line taped in blue near the Q/D. Are you sure it's not kinked just past that ?
You need a manometer to check gas pressures.

Your guy replaced the burners.... did he clean the orifices ?
The burner has nothing to do with the orifice.
The burner slides onto the orifice.... in the BBQ and the fireplace.

It's an extremely common problem for spiders to crawl into the orifice and build a nest.
When the gas is turned on... the nest plugs the orifice from the inside.
They must be physically cleaned.
Old 05-28-24, 04:57 PM
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Thanks as always!

I passed on your comments. I think though, gf an orifice was plugged, that wouldn't explain the reduction in the flames as you open more burners?

He'll check the hose from the Q/D, but I think it's just how the pic looks.

I did wonder - the Q/D is pointing up. It is usually covered, but water / dust can collect in the open port when the hose is disconnected. Likely need to take things apart... might as well (replace?) and point the QD horizontal...

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