DIY : PTFE line- tank to HPFP + inline fuel filter upgrade

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doublespaces

Administrator
Oct 18, 2016
6,681
AZ
Mmmmm. I think you'd actually want to filter the fuel before it goes into the sensor. Also for terminology's sake, AFAIK, the ECA is just the computer box thingy like the boostbox. The part that goes inline with the fuel hose, is a Flex Fuel sensor. The computer box does the analysis of the signal sent by the sensor itself, someone please correct me if this is wrong.

So what you'd do most likely, is cut that long hose and shorten it up by however long your fuel filter is. That is more or less my basic plan anyway. Some people are saying to put the flex fuel sensor on the return line or inside a Y to Y hose to alleviate flow restrictions, although for my purposes it probably won't matter.
 

Jeffman

Lieutenant
Jan 7, 2017
847
Update: I received my MOTIV ECA with short line engine bay upgrade. The shorter hose will bend around the starter motor. It uses same couplers as discussed in this thread. So I believe all I need to do is insert the fuel filter between the shorter hose and the ethanol detector, using a female-female coupler: https://www.amazon.com/dp/B001DSV408/ref=cm_sw_r_cp_api_YteZAb7M3P8CG.
EDIT: Correcting post based on Doubles’ comment below. The filter may fit better on the upstream side of the detector. I’ll know better when I get in there.
View attachment 10523 View attachment 10524
I noticed these fittings seem a bit loose. What’s the best way to keep them tight? Maybe some Locktight?
 

Jeffman

Lieutenant
Jan 7, 2017
847
Filippo,
Did you fire her up yet?
Wondering whether the Fuelab filter minus the HPFP filter sleeve is much of an improvement.
 
Aug 11, 2017
1,614
Virginia
Filippo,
Did you fire her up yet?
Wondering whether the Fuelab filter minus the HPFP filter sleeve is much of an improvement.
No I haven't. Honestly I doubt we'll ever know if it is an improvement in that way. I suspect that filter, as small as it is, was not expected to ever see much of any particulate by BMW. Mine was clean but others we have seen are dirty. I ended up changing it primarily because the larger filter is good hygiene.

Filippo
 
Feb 4, 2018
16
When you drilled out your fuel rail. did you only do the the rail? of did you also do the ports to the injectors as well. I just finished up the rail but not the ports to the injectors.
 
Sep 6, 2017
468
Down Under
There is no point doing the injector ports absolutely no benefit

When you combine the size of all six ports of the rail inlet port is smaller.
 

Abacus38

Lieutenant
Nov 2, 2016
515
Tampa/Orlando, FL
Thanks for the DIY. Chris sent me my flex fuel tune today so I went ahead order the sensor and stuff needed to create a new line from the tank to the HPFP/PI
Screenshot_20180601-220452.png
 

aus335iguy

Lieutenant
Nov 18, 2017
764
Has anyone replaced the hardline altogether? WHat thread is on the HPFP and the sensor ?
 
Feb 18, 2017
127
ROC NY
Thanks for the DIY. Chris sent me my flex fuel tune today so I went ahead order the sensor and stuff needed to create a new line from the tank to the HPFP/PI
View attachment 11978
Where did you order that from? I’m going to get the innovative gauge that comes with the sensor but I’ll need the other stuff.
 

doublespaces

Administrator
Oct 18, 2016
6,681
AZ
Didn't he say somewhere he wishes he used a different brand? Maybe that was someone else.
 
Sep 6, 2017
468
Down Under
I've seen the plastic ones pop off many times and almost start a fire, wont use them even if given to me for free or get paid to put them on. Dangerous.
 

Abacus38

Lieutenant
Nov 2, 2016
515
Tampa/Orlando, FL
I've seen the plastic ones pop off many times and almost start a fire, wont use them even if given to me for free or get paid to put them on. Dangerous.
I see what mean. I have to redo my order anyway since I need to make a y line for my PI kit. The kit I have uses those same plastic fittings. I was going order fuel it line until I saw the price lol. I can make that line myself for half the price.
 

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