Flex Fuel Sensor MS3

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  1. #1
    Member Array partzman's Avatar
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    Default Flex Fuel Sensor MS3

    I picked up the PNP Megasquirt system for my 3.4 build. I had a couple of questions about the flex fuel sensor. I was planning on running the GM/Continental sensor. Is there a pigtail offered by GM? Also where has everyone been plumbing the sensor in a return style setup. I have a Fore system. Trying to get the last few things figured out.

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  3. #2

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    I got my sensor from Summit and it came with a pigtail.
    Here's a pic of the sensor with the adapter I made that splices into the return line.

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    ks

  4. #3
    Member Array partzman's Avatar
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    Good to know the summit piece comes with a pigtail. I didn't see it in their pic. I will call my fab guy and see if he can make something similar. I can't TIG to save my life.

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  6. #4

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    I bought the Pro-M piece and a pigtail from boost monkey on Amazon with 10ft of wire so I only need to make 1 splice for each wire.

  7. #5

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    Quote Originally Posted by partzman View Post
    Good to know the summit piece comes with a pigtail. I didn't see it in their pic. I will call my fab guy and see if he can make something similar. I can't TIG to save my life.

    If you feel your TIG welding skills are little short of the mark Kyle, then you might like this approach that Josh (Godstang) used, click here => Flex Fuel Sensor Plumbing.

    Josh plumbed the sensor in parallel with the main fuel feed and used just plumbing gizmos to do the job.


    Ed
    Last edited by eschaider; 08-30-2020 at 07:01 PM. Reason: Fixed Broken Link

  8. #6
    Member Array 01yellerCobra's Avatar
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    I plumbed the sensor in the return line. Seeing as I run a deadhead system I figured that would be more beneficial. However I have yet to get the sensor to work. I used the ECU 12v for power and I'm guessing it's not providing enough power. I keep getting an error code. But to fix it requires pulling the tire and fender liner.

  9. #7

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    What was the benefit you were attempting to take advantage of, Bob?


    Ed

  10. #8
    Member Array partzman's Avatar
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    The PRO-M piece looked pretty great so i went with that. Really trying to take advantage of this MS3. Flex fuel and adjustable traction control should be fun.

  11. #9

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    When you guys start to implement the flex fuel sensor(s) be sure to check out the plumbing diameter, most use a 5/16" tube. A 5/16" OD tube with 1/32" wall thickness is only a 0.250" ID for fuel flow. there are a few ⅜" OD tube sensors also available. A ⅜" OD with 1/32" wall tubing provides a slightly larger 5/16" id for fuel flow.

    In the real world either would likely work adequately for ethanol content sensing purposes, The issue comes when you begin to plumb the sensor into the circuit. If you choose to do it on the feed side and you have a #10 AN feed line the sensor will need to be plumbed in parallel to the #10 feed line. No big deal right? Be careful if you use a "Y" adapter. You want all branches of the adapter to accept #10 AN fittings. On the sensor leg of the "Y" adapter use adapters to mate with the required #6 or #8 AN to EFI plumbing adapters to plumb in the sensor. On the other leg of the "Y" fitting use a #10 line to maintain the flow capacity you need to feed the engine.

    Depending on which sensor you use (5/16" or ⅜" tube) you will need an appropriate AN adapter. Russel offers the adapters through Summit and Jegs. Here is a pic from Summit of the Russel listing for both adapters;

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    Note the ⅜" diameter fuel line adapter at the bottom of the listing uses a -8 instead of a -6 AN fitting.

    Although it may not matter, the fuel flow through the -8 plumbing will be greater than the corresponding flow through the #6 plumbing which means the sensor will report more quickly any changes in the incoming fuel's ethanol content with the larger plumbing. If you search for sensors by tubing size on Summit you can quickly sort the alternatives into the two sizes and choose the one you prefer to use.



    Ed


    p.s. If you choose to do the plumbing on the return side be aware that reduced tubing diameters can produce a back pressure to the returning fuel creating an unintended and unwanted rich condition whenever return fuel flow exceeds plumbing flow capacity. Additionally placing the sensor on the return side only tells you the horse has left the barn after he is gone. For best engine fueling you want to know about the fuel's ethanol content before it is injected into the engine — which will argue for a feed line placement of the sensor not a return line placement.
    Last edited by eschaider; 08-31-2020 at 04:37 PM. Reason: Added Postscript

  12. #10

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    So I couldn't find a switched accessory when I wired up my sensor, and then remembered that the there was a 12V supply out on the accessory plug on pin D, so I used that for my power. That should be fine, right?

  13. #11

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    As long as it is switched you should be good to go. The sensor has very modest power requirements.


    Ed

  14. #12
    Senior Member Array badcobra's Avatar
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    Finally a vendor came up with a nice solution for this.

    https://www.motionraceworks.com/prod...n-6an-8an-10an

  15. #13

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    They are very impressive guys, Tony. That gizmo is just the tip of the iceberg for what they offer. Their design uses an internal bypass to avoid choking off the fuel supply to the engine. I ordered one as soon as they told me about the internal bypass! Thanks for the heads up.

    Here is a gizmo pic;

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    Ed
    Last edited by eschaider; 11-19-2020 at 01:49 PM. Reason: Fixed broken pic link

  16. #14

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    Of course as soon as I see this, they are sold out of them.
    Ed, do you know if it’s compatible with the ProM sensor Josh used that reads temp as well?
    Edit: Never mind the question regarding the ProM sensor. Went back and read through some pages and realized this isn’t necessarily needed if using the the ProM sensor and vice versa!

    Thanks
    Ken
    Last edited by 4sdvenom; 11-16-2020 at 07:24 PM.

  17. #15

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    When I ordered mine Ken, I asked for the one that would work with a sensor that has the ⅜" fuel nipples. There is also one that can apparently accommodate the 5/16" fuel nipples. The 5/16" hardware would probably work fine but just to be safe I chose the ⅜" plumbing instead. One of the sensors that uses the ⅜" plumbing is the Chevrolet AC Delco part# 13577429.

    I have seen OEM AC Delco manufactured versions of the sensor with that part number at price points ranging anywhere from low $60's to high $80 numbers depending on where you source them. I would be cautious of any potential low buck knock off product offerings because of the potential engine damage possible if the sensor is unreliable. This is an item I feel safer about, knowing it is a an original AC Delco OEM component.


    Ed
    Last edited by eschaider; 11-16-2020 at 06:32 PM. Reason: Added Delco part #

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