Fuel pressure inconsistency run to run Aeromotive

[Mike Taylor 3601]

Had customer pulled his hair out over fuel pressure,would be 6-7lbs. then next thing you now would be 2-3lbs then back. changed regulators 3X,checked pump out,looked OK,he bought a new aeromotive just like he had,same thing. He found out line was sucking together between tank and pump, just took him 2 weeks to figure it out.
Mike Taylor 3601