In my case the fuel was literally boiling. That's why I wanted to make sure your fuel pump was cold to the touch. It is not unusual for liquids to boil in a dead headed pump.
I don't suspect a vapor lock condition cruising at 40 mph.
In your case the air could be peculating around/thru a leaky pump diaphragm.
Also your pump check valves could be leaking thus not holding full pressure.
What is aprox diameter of the bubbles? Got any pics of your ride?
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Originally Posted by 001mustang
That being said, you did not mention the possibility of a leaky diaphragm.
When you assembled the fuel pump was the pump spring in the correct tension state while installing the diaphragm? Was the diaphragm new or old stock?
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