Are you sure you are going the proper direction with fuel?
I don't have much experience with GSL-SE's, but I assume they have a pulsation damper. The fuel should go from:
1) the pump
2) the filter
3) the pulsation damper
4) the rail and injectors
5) Pressure regulator
6) back to the fuel tank return
Make sure that is the correct order, and you are not going straight to the regulator.
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1976 Mazda Cosmo RX-5
1976 Mazda Cosmo RX-5
2003 Toyota Tundra TRD
2015 Toyota 4Runner SR5
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