Originally Posted by RallyBob
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'.
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The Focus fuel pumps can handle up to 425 rwhp. Lets try and keep and open mind here. Ok there PWM pumps we can deal with that!