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What's the go with return line?
The FPR is vacuum driven, which sounds like a cheap way of avoiding PID on the pump.

If you were to remove the FPR, block the return line, I suppose a static pressure sensor on the line would be needed and PID control to adjust the pump speed to suit.

Which then gets to my question: Would switching to a returnless fuel system deliver savings (or possibly consume fuel due to possible greater fuel pressures and therefore more fuel injected?)