Hypothetical question-

I've replaced the injector return lines on my Mercedes and 6.5 burb in the past. I've been thinking about the return flow.

How does the fuel "flow" from one injector to the next via the return line. Does it matter if you have the line on one side or the other (of the injector)? Meaning, could I put the plugged line on the rear injector on the front side nipple and the line going to the next injector on the rear side?

In thinking about it, I can't see a reason why it would matter, but I guess I don't really understand how the fuel flows. To me it seems like fuel is brought to the injector through the injector lines and any unused fuel is pushed out into the return lines on both sides (following the path of least resistance which since the back is capped is towards the front). Is this correct?

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2009 ML320 Bluetec
1985 300CD
1981 300TD

Past Mercedes
1979 300TD
1982 300TD
2000 E320 4Matic Wagon
1998 E430
1984 300SD
1980 300SD