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So I will answer these questions again in greater detail.
There are two answers to your question:
First, YOU MAKE a TWO line system into ONE line right at the injectors fuel rail,
With a two line system (One being the return line) system with return lines you can add an aftermarket fuel regulator at the point of the TBI or Fuel Rails, connecting the return line there and leaving a single fuel line long enough to put the fuel flow sensors between the new fuel pressure regulator then hook up a line from the flow sensor to supply the TBI (in my case on my Van’s engine) or at the fuel rail on say a pre 03 Crown Vic. I did this set up with my 93 Chevy van.
When I install my new 383 it will be running a Tune Port intake, same problem.
Second with many post 02 cars the fuel systems have switched to single fuel lines placing the fuel return lines at the fuel pump within the fuel tank, so there is no return lies at the engine.
So in both cases we now can have a single final fuel line at the final fuel delivery system where we can place the flow sensor with the added bonus of now having an adjustable fuel regulator.
Rich
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