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Your post seemed as though you bypassed the pump, no biggie. The only way to measure the cranking flow is on a pump stand. A trick to try and force feed rail pressure is to pinch/plug off the return line going back to the tank, do this as close to the engine as possible. It should make some...

^^ That is incorrect. A PT system has no pressure at idle, only a spike on acceleration. There will only be flow, measurable with a flow meter in lbs per hour. Rail pressure only happens when loaded. No cracking lines needed, it is self priming. PT screen filter is only there IF a pump failure...