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Hello, my name is ***** ***** I am going to assist you wtih this.
What is the full model number of the genset, exactly as it is written on the data label?
Your lock off pressure is way too high. The lock off pressure should only be 0.15"WC to 0.25"WC.
Sorry, I didn't realize you were working on a liquid withdrawal system - you didn't mention that.
What you are describing would normally be attrributed to a stiff or contaminated diaphragm. But since your regulator is new, that should not be an issue.
Without being able to see this, I am not sure where to go next.
I will opt out of this question. Perhaps another expert will be able to assist you.