Returnless to return-style fuel - what changes in PCM?

[kdmport]

Sent my PCM in for a PATS delete and change-over to return-style just to get going.  HP Tuners VCM on the way so I can start to play.  Can anyone tell me what is done to go from returnless to return fuel setup?

[derfdog15]

IIRC you would adjust pressures, and possibly have a temp factor for hot gas returning to the tank. However, I haven't heard of a PCM being sent in to go return style. Is this for the bronco project?

[kdmport]

It is for the Bronco project.

I sent it in for the PATS mod, but at the same time discussing it, there was concern that the RSC module (lack thereof) would prevent the returnless from operating properly due to no-signal fuel shutoff.  So they said they could convert the PCM to function as return-style.   I have asked for clarification, no response yet and I can sometimes be impatient to learn...

[SHOdded]

I dont have a clue about the specifics, but since the same PCM can be configured to operate a variety of configurations, that is likely what they are doing.  Taking the asbuilt data from a vehicle that has a mechanical return, for example.

[kdmport]

I know they do it in the controls pack for the FRPP crate motor - just not sure what is done.  Somehow the FPDM system is disabled.  The tank I'm waiting for has all the provisions for EFI tho, including return and in-tank pump so as long as it works... but I'd still like to know.