The "physical" location is immaterial. It's the "HYDRAULIC" location that's critical. The fuel rail needs to be on the high pressure side of the regulator in any case.
Fibunachu's Figure 2 is equivalent to having the fuel rail on a tee with the regulator downstream of that. It's just that the tee is built into the regulator.


Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.