Originally Posted by markandson
Ahh....something else I apparently don't know enough about. I assumed it was a simple system with a pump and an accumulator and a pressure switch to just keep the accumulator at the specified pressure thereby eliminating the need for a return line. I guess it must be more complicated than that.
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A bunch of newer cars have returnless systems that are done by the OEM's simply for cost/simplicity. The ECU controls the pump essentially, but there is a cap as to the limitations of these systems. For aftermarket performance upgrades, most folks scrap the returnless system and plumb a 'normal' return-style system.
Example: 350Z Nissans use a returnless system, when turbocharging them the fuel system is often the limiting factor. Plus a return-style system runs cooler...unused fuel in the feed line goes back to the tank, mixes with the remaining fuel, and comes back 'cooled off'.