pshojo Posted July 1, 2012 Report Share Posted July 1, 2012 I was ready that the series III has a returnless fuel system. Does anyone know what makes it returnless? is it simply how the fuel rail or how does it work? Quote Link to comment Share on other sites More sharing options...
Andrew Posted July 1, 2012 Report Share Posted July 1, 2012 (edited) In previous fuel systems, fuel was pumped up to the rail, and the excess was returned to the tank. Series 3 has no fuel return. Edited July 2, 2012 by Andrew Quote Link to comment Share on other sites More sharing options...
pshojo Posted July 1, 2012 Author Report Share Posted July 1, 2012 I was thinking about that, the fuel pump might regulate and dump extra back into tank? Wonder If i could use the Gen III fuel rail on Gen II car. Quote Link to comment Share on other sites More sharing options...
AL Posted July 1, 2012 Report Share Posted July 1, 2012 I think youll also need the Gen III Fuel pump as it doesnt have the return line going into it Quote Link to comment Share on other sites More sharing options...
95 vert Posted July 1, 2012 Report Share Posted July 1, 2012 Return less fuel systems have the regulator in the pump. Quote Link to comment Share on other sites More sharing options...
pshojo Posted July 1, 2012 Author Report Share Posted July 1, 2012 That's kind of what I was figuring. Quote Link to comment Share on other sites More sharing options...
AL Posted July 1, 2012 Report Share Posted July 1, 2012 Really? Is it just blocked off? Quote Link to comment Share on other sites More sharing options...
pitzel Posted July 2, 2012 Report Share Posted July 2, 2012 Yeah, as the others have said, to maintain a constant pressure, the pump can either: a) operate at the same output all the time (very reliable for the pump as its not cycled), and use a regulator to bypass the extra volume that isn't necessary to maintain fuel system pressure at a constant level. vary the speed and/or duty cycle of the fuel pump (not very reliable). My Jaguar E-type does , in that, it constantly cycles the fuel pump on and off. As a result, the fuel pump tends to have reliability issues in contrast with the extremely reliable pumps used on the W-bodies. Quote Link to comment Share on other sites More sharing options...
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