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MissWatson MissWatson is offline
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Default 320i/N20 Flex Fuel Connector with JB4 - 08-22-2018, 11:56 PM

This is my first post!

I'm posting because I recently bought a JB4 for my 2015 320xi. I followed the instructions in the pdf, looked at a lot of JB4 installation videos, and I still can't figure out how to attach the flex fuel connector. I know where it is, it's at the end of the fuel rail. But I don't know what I'm supposed to do with it exactly. So.. long story short I left that one out, I connected all the other wires and successfully started the car without any check engine light or warning. The maps seem to be running fine, I instantly noticed the increased performance. But the instructions say that the flex fuel connector is required for the 320i

I don't know what to do I guess, any advice? How do I plug it in? Is it okay to leave it not plugged into anything?
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Payam @ BMS's Avatar
Payam @ BMS Payam @ BMS is offline
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Default 08-23-2018, 05:14 PM

Quote:
Originally Posted by MissWatson
This is my first post!

I'm posting because I recently bought a JB4 for my 2015 320xi. I followed the instructions in the pdf, looked at a lot of JB4 installation videos, and I still can't figure out how to attach the flex fuel connector. I know where it is, it's at the end of the fuel rail. But I don't know what I'm supposed to do with it exactly. So.. long story short I left that one out, I connected all the other wires and successfully started the car without any check engine light or warning. The maps seem to be running fine, I instantly noticed the increased performance. But the instructions say that the flex fuel connector is required for the 320i

I don't know what to do I guess, any advice? How do I plug it in? Is it okay to leave it not plugged into anything?
So you have the fuel wires left loose? It should be the same as all the other sensors you attached.


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MissWatson MissWatson is offline
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Default 08-26-2018, 04:31 PM

Quote:
Originally Posted by Payam @ BMS
So you have the fuel wires left loose? It should be the same as all the other sensors you attached.
Yeah they're left loose, it was impossible for me to connect them without removing the engine block. Still works though.
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Terry @ BMS's Avatar
Terry @ BMS Terry @ BMS is offline
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Default 08-28-2018, 07:53 PM

The N20 fuel wire isn't *that* hard to reach? Photo of what you're looking at there?


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It is the sole responsibility of the purchaser and installer of any BMS part to employ the correct installation techniques required to ensure the proper operation of BMS parts, and BMS disclaims any and all liability for any part failure due to improper installation or use. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. BMS claims no legal federal, state or local certification concerning pollution controlled motor vehicles or mandated emissions requirements. BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways. Please click here for more information on legal requirements related to use of BMS parts.
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CntryClub007 CntryClub007 is offline
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Default 12-21-2018, 11:05 AM

It should be very easy to install, and you can see how the connector works via the connector on the JB4 harness. You obviously removed the sound silencing foam to access it. I would recommend you install it and take it one step further, run some E85! I have a 320i w/ JB4 and methanol injection and the car really likes a little E85 to go with 93.

Let us know if you have any issues,
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