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How To: Install a fuel pressure sensor & log with ECMLink

Posted by punk3rz, Sep 7, 2018

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  1. punk3rz

    punk3rz Proven Member

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    I'm going to show you how to install a fuel pressure sensor and log it with ECMLink.

    First off, I was going to purchase a name brand fuel pressure sensor but after talking to a few people, I just went with an el-cheapo off eBay.
    Just make sure it's a 5v fuel pressure switch- I went with 100 PSI.

    You'll need:
    Fuel pressure sensor
    -6an female to -6an male with a 1/8" tee (or whatever size lines you’re running)
    Teflon tape (yellow tape made for fuel is preferred but this is what I had, hopefully it holds up.
    Fuel01.jpg

    Tape the threads to prevent fuel leakage:
    Fuel02.jpg

    Attach your FPS to the tee and make sure it's tight.
    I probably went a little overkill but it's not going to leak:)
    Fuel03.jpg

    Here it is all secure:
    Fuel04.jpg

    I removed the fuse from my fuel pump rewire and attempted to start the car several times to take as much fuel out of the lines as possible. It's best to let the car sit until your gauge reads 0 if you've been driving your car recently:
    Fuel05.jpg

    Put some paper towels under the fitting to catch the fuel when you break the fitting loose:
    Fuel06.jpg

    Attach the tee to the AFPR as so(I positioned the plug at a 45* angle towards the firewall)
    Note: your fuel pressure sensor needs to be after your fuel rail/injectors so you’re logging the pressure after the rail.
    This makes sure you’re keeping pressure to your injectors/rail:
    Fuel07.jpg

    Attach the return line to the tee and reinstall the vacuum line if you removed it:
    Fuel08.jpg

    Now you're going to wire in your sensor.
    It requires 5v which is only pin 81 in a 2g but branches off to your MDP, MAP, and TPS.
    On my car, I'm running speed density with a GM-style map sensor so I'm not using my MDP plug so that's where I'm going to tap into for this install.
    If you're using all your sensors, wire the positive of your fps to pin 81(5v), negative to pin 92(ground) and input signal to whatever you choose(EGR, MDP, MAP, Front o2, etc)
    As for the MDP, here’s a diagram...
    Green/yellow: 5v power
    Black: ground
    Light green/black: input
    Regardless where you tap into these wires, whether it be MDP, MAF, or TPS, the wire colors remain the same
    Fuel09.jpg

    I cut the plug and soldered/heat shrinked the sensor plug to my engine harness:
    Fuel10.jpg

    Now plug it up to your sensor:
    Fuel11.jpg

    Reinstall the fuel pump rewire fuse if you pulled it:
    Fuel12.jpg

    Now to the ECMLink side of things.
    TURN YOUR FUEL PUMP ON VIA LINK AND VERIFY YOU HAVE NO LEAKS.
    FUEL LEAK=BAD
    My actual fitting on my fuel filter started leaking from being disturbed, this step is crucial!
    Fuel13.jpg

    Now to set up the sensor to be logged.
    Connect to your car and go to ECU Inputs:
    Link01.jpg

    Now locate which sensor input your tapped into and select linear fuel pressure sensor and click "Save pin assignment":
    Link02.jpg

    Click "Captured Values":
    Link03.jpg
    Add linear fuel pressure to the captured values:
    Link04.jpg

    Go to displayed values and add it to your displayed values:
    Link05.jpg
    Start a log and right-click "LinFuelPress" and open preferences:
    Link06.jpg


    Set your values up as per sensor specifications.. Mine was 0.5v = 0psi, 4.5v = 100psi:
    Link07.jpg

    Now start your car or activate your fuel pump and start a log and make sure it's logging!:
    Link08.jpg

    VIOLA! You're now logging fuel pressure so your mean ole' tuner can't say you're having fuel pressure issues:)

    If you have any questions, please feel free to message me or email me at [email protected]

    Visit us on Facebook!
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    Main Street Auto and Fabrication
    Located in Surgoinsville, TN.
    We specialize in 4g63 powered vehicles.
     
    Last edited: Sep 8, 2018

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  2. Jacolu3

    Jacolu3 Proven Member

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    Did you connect to the feed or the return of the fpr?
    And what color wires did you use on the mdp connector?
     

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  3. punk3rz

    punk3rz Proven Member

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    Surgoinsville, Tennessee
    This is hooked up to the return. You want to log the fuel pressure after the rail/injectors to ensure you’re keeping the injectors fed. (Feed side of the fuel pressure regulator)

    MDP wire colors are as follows:
    Green/Yellow: 5v positive
    Black: Ground
    Light Green/Black: Sensor input
     
    Last edited: Sep 7, 2018

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  4. Jacolu3

    Jacolu3 Proven Member

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    O OK. I thought the side of the fpr was the feed and the bottom was the return. Well at least that's how mine is.

    Great write up with great info!!!
    Thanks for the info!!!
     

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  5. punk3rz

    punk3rz Proven Member

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    I misread your comment. It’s hooked up to the feed side of the AFPR. Sorry for the confusion.
     

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  6. 316wuino

    316wuino Probationary Member

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    How close is your laptop reading vs your mechanical gauge?
     

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  7. punk3rz

    punk3rz Proven Member

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    I literally just got done installing it but my gauge is set at 44psi and it’s reading 46 in link. I’m sure this can be adjusted if I played with the min/max voltage in the preferences but it seems to be very close.
     

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  8. GST with PSI

    GST with PSI DSM Wiseman

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    Great write up. Thanks for the contribution :thumb:
     

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  9. punk3rz

    punk3rz Proven Member

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    All PMs replied to.
     

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    1998 Mitsubishi Eclipse GSX
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  10. punk3rz

    punk3rz Proven Member

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    Joined Jun 1, 2012
    Surgoinsville, Tennessee
    All emails replied to
     

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