Jump to content

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


Recommended Posts

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.

Link to comment
Share on other sites

So after getting the data logging hooked up and understanding a tad bit more it seems that my pats may be enabled on this ecm. 


What are some common PIDs to look at when determining if pats is still enabled?


Thanks again if anyone knows. I will also post this on other forums and if I find out I will reply to this thread.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Unfortunately, your content contains terms that we do not allow. Please edit your content to remove the highlighted words below.
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...