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This would have nothing to do with the sub tank.
So If i understood this correctly... Fuel flows steady on the OUT line of the filter, but not at injector?
This has the injector pump symptoms. Do you have access to a code reader like Scangauge or something? If not I'd head to super cheap, they charge a small fee to plug their device in and read for any codes. I'd start here, and could give you a heads up as to where it's gone pear shaped.