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hey guys I have a 3406c mechanical 3zj. Few months ago it just happened one day where it started to idle rough off and on. It will clean up if you get on it power is the same etc. Will just idle rough off and on. I checked the 90 with orifice on the back of the pump and it’s clean. I also swapped both fuel lines and fuel and water separator filters to new. Now here’s where I need input. I was pushing the hand primer today to see if I can hear anything and either at the back of the pump or around the fuel lines I can hear what sounds to be air coming out from somewhere but can’t see ****. I even sprayed it down with soapy water and nothing. But I can hear air escaping somewhere in the back of the pump area or that same area upward around fuel lines. Any guesses. I put a clear hose on by the water separator when o was first checking things and had air bubbles so assumed it was the fuel line and just did both plus new filters. But nope. Can hear air somewhere
 
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