Won't be regulator if you have the return line blocked off. Check your voltage at the pump when it starts to lose pressure, make sure it's not dropping to 8 volts or something stupid, as remember, you have probably near 20 feet of wire, I don't know what size wire you used, but for that long stretch of wire I would run a 12ga wire to power it, to keep voltage drop to a minimum. When the wire heats up, voltage drops even further. You could also by-pass your fuel filter, just put a barb in temporarily and see if that makes a difference. As other than that, your fuel is boiling or you have another bad pump.
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