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Hello, it sounds like the frame mounted fuel pump isn't any good. It sounds like it can't keep up with the volume needed.
Put your gauge/ fuel bleed off at the electric pump and check there. If it is still aerated, check for the primary filter not being installed correctly, not seated all the way, or a possible incorrect fuel filter. If it is not aerated at the electric pump, then reconnect the system, block off one head at a time and recheck the aeration. If either head is blocked off and the concern is gone, suspect an injector or injector o-ring issue. If neither head blocked off does not remove the aeration then the high pressure pump is bad.
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I remove the fuel line and put caps on it it block it off. If the engine will start and run. If there are no sources causing aeration, then it would auto purge out the air pockets in about 2 minutes of run time on its own.