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Besides adding one shim to the FD pressure regulator, check the condition of the small o-ring at the end as this is what is stopping the flow of fuel until the spring compresses. Also, check how long fuel pressure holds up after the car is turned off as a weak or worn o-ring will cause the pressure to decrease pretty fast.
Others on the forum have much more expertise than me so maybe wait for a few more suggestions before doing anything.
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