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Old 07-28-2017, 01:54 PM
Cumminscj Cumminscj is offline
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Anyone Done an LTR returnless to return conversion?

Looking to see if anyone has successfully converted a returnless LTR engine to return style fuel system? From looking at everything it looks like either way it should be a 3 bar system and it should be as simple as plumbing the return line to the tank. The regulator is already on the rail, just remove the plug and install the line. Of course hacking it into the module may require some creativity, but that should be easy.

Reason for doing is the brand new millennium fuel pump module installed by MasterCraft is producing about 58 or 59 psi. The module that was in the boat when we purchased it(installed by same dealer) ran the same pressure (5si). Apparently it is only supposed to be 44psi(3bar). As an alternate I guess I could try and source the regulator that is part of the module assembly. So if anyone knows a part# or source for that I would be interesting in trying that out as well.
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Last edited by Cumminscj; 07-28-2017 at 08:30 PM. Reason: Typo
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Old 07-28-2017, 10:51 PM
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mikeg205 mikeg205 is offline
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those regulators are mopar parts...

start here

Regulator on fuel cartridge Mopar part # 52021983aa airtex part # 5g1476
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Old 07-29-2017, 09:46 AM
Cumminscj Cumminscj is offline
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Thanks! Going to go to the parts store and get the specs on that and compare them to the 40 psi version to make sure they will swap
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Old 07-29-2017, 10:03 AM
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whiskeyriver whiskeyriver is offline
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The regulator listed above is a 60 psi. You need a BWD 23081 for 40psi. I can't remember the mopar part number. (Will try to find it) I did the return conversion on my boat, I used a 60 psi millennium regulator on the fuel pump module and tha regulator on the rail cuts it to 40 psi. Mine definitely seems to run a little better in all aspects, however I now have the same hot start issue as you. I also replaced all of my injectors with brand new AC-DELCO injectors.

EDIT; uh-oh, wait a minute. That may be a bad part number too, let me research, be right back.

EDIT again; Ok that BWD23081 is a good part number (just need to talk to a competent parts person!) Also found the mopar part number, 4864839ab. This is for the 40psi regulator on the module.

Last edited by whiskeyriver; 07-29-2017 at 10:27 AM.
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Old 07-29-2017, 10:30 AM
Cumminscj Cumminscj is offline
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Ya currently my regulator on the rail is blocked off. So hopefully that part number you have for the 40 psi regulator works out. You don't need to look it up I have it saved on my phone. Will let you know if the restart issue is cured by running 40 psi. Indmar swore updating the ECM would not correct this problem as their fuel curves were written for 40 psi. He will get me the most up to date call file if I get the pressure right and have some other issue or the same issue persists.
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Old 07-29-2017, 10:33 AM
Cumminscj Cumminscj is offline
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Quote:
Originally Posted by whiskeyriver View Post
EDIT again; Ok that BWD23081 is a good part number (just need to talk to a competent parts person!) Also found the mopar part number, 4864839ab. This is for the 40psi regulator on the module.
Thanks!
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Old 07-29-2017, 10:50 AM
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mikeg205 mikeg205 is offline
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Quote:
Originally Posted by whiskeyriver View Post
The regulator listed above is a 60 psi. You need a BWD 23081 for 40psi. I can't remember the mopar part number. (Will try to find it) I did the return conversion on my boat, I used a 60 psi millennium regulator on the fuel pump module and tha regulator on the rail cuts it to 40 psi. Mine definitely seems to run a little better in all aspects, however I now have the same hot start issue as you. I also replaced all of my injectors with brand new AC-DELCO injectors.

EDIT; uh-oh, wait a minute. That may be a bad part number too, let me research, be right back.

EDIT again; Ok that BWD23081 is a good part number (just need to talk to a competent parts person!) Also found the mopar part number, 4864839ab. This is for the 40psi regulator on the module.
thanks whiskey - I added to automotive cross reference in the library.
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Old 08-13-2017, 02:55 PM
Cumminscj Cumminscj is offline
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Swapping the regulator out worked like a champ. I used a Napa echlin part 2-19737. Millennium fuel module part number is in attached picture.
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