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flex sensor plumbing

Posted: Wed Nov 07, 2018 9:18 pm
by orrinmcdrift
I want to add a flex sensor to my fuel system that consists of a 50 ltr cell and a 044 lift pump to a 2.5ltr surge and 2x 044 feed pumps.
The whole system is in -8 hard line and i believe the flex sensor can be adapted to -6 using a adapter.
My thinking is fitting the sensor in the line going from the fuel cell to the surge tank, in turn testing that fuel coming from the lift pump to that surge tank before it enters the main system and not restricting the flow too much?
Is this my best option?

2JZGTE
elite 2500
Wide band
IQ3

Re: flex sensor plumbing

Posted: Thu Nov 08, 2018 2:38 am
by natanel
Does your system has a return line?

Re: flex sensor plumbing

Posted: Thu Nov 08, 2018 12:10 pm
by HaltechMatthew
All OEM mountings of these sensors that I have seen have them in the pressure line. But for what you have there, to prevent restriction, I would Y-piece it and run parallel to the main line but do this in the engine bay preferably near to the fuel rail. This is the get a more accurate reading of what the injectors are actually seeing.

Re: flex sensor plumbing

Posted: Fri Nov 09, 2018 4:51 pm
by Mobne_s13
Why not put it on the return line after the regulator?

I can’t see how the actual value would drastically change?
I mean if you change fuel the fuel is allways
Flowing trough the system even with only ignition on, mixing it.

In my case where I don’t run a flex fuel system only run e85 and use the flex sensor for sensing the quality it will be on the return line just because the small diameter of the sensor pipeing.

Re: flex sensor plumbing

Posted: Mon Nov 12, 2018 10:11 am
by HaltechMatthew
Often they will read erratically as the fuel pump nears its limits, namely high rpm and load as less fuel is returned to the tank.