Undue the gas cap if the problem still exists its not the vent. Many tanks have a valve at the tank to open/close, make sure the valve is open. I draw from only one tank at a time the other two are closed.
When is the last time you changed filters? Do you have primary filters like Raco. If you have Racor you can install a vacuum gauge that screws into the top that will tell you if filters need to be changed.
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