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unregulated it puts out 0psi
the regulator is what makes the pressure, the pump just provides volume.
pressure does not mean volume. as pressure goes up, volume drops. In other words, as your fuel pressure climbs, your available fuel feed (supply) dwindles.
This is one reason I always keep fuel pressure as low as possible. Another reason is, lower fuel pressure is less wear/tear on your fuel pump and, will help keep the fuel cooler too.
From the other side of the fence, higher fuel pressure might give better fuel injector atomization, leading to higher quality combustion and better fuel economy, and may help prevent misfires, especially when using large, inefficient injectors.
other things to try:
1. clean your maf hot-wire
2. check for vacuum leaks, especially after the maf but before the turbo
3. make sure the alternator is charging
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