It could be either of the regulators. You need to get outside to see which cylinder the gas is coming from. If this only happens when coming from the side with the red regulator, change it out. If it comes when running from either side, replace the main regulator. They aren’t all that expensive. We had one making the noise, but after a while it went away and never did it again. I don’t believe it will hurt anything making the noise.
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Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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