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Return-less to Return Style ecm tune: What is MRFS (Mechanical Returnless Fuel System)?


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So I am new, may be obvious but just putting that out here; But, what is mechanical returnless fuel system? Did some inter-webbing and it looks to be a conversion from a returnless to return style system and I just want to make sure that I understand the values in PCMTEC software:

I have a return style setup and want to "play" or "test" with these types of scalar settings.

Extra ???:

If anyone knows of some settings for a stock (pats deleted/off) 2015 coyote return-less ecm to a return style ecm configuration please let me know. I have gone through what I think are ford control pack configurations on the calibration list however I am not getting any spark quite yet. 

Thanks in advance for any information.

Edited by hitmanpc
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