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Thread: Alternative fuel pressure sensor option

  1. #1
    Advanced Tuner Niemer's Avatar
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    Alternative fuel pressure sensor option

    Sensor: ACDelco #13500745, 0-100psi ~$25
    Connector: Delphi #13511131 qty. 1
    Terminal: Delphi #12191818 qty. 3
    Secondary Lock: Delphi #15418545 qty. 1
    Wire Seal: Delphi #15366060 qty. 3

    HPTuners PID Config. Volts/.0371 + (-13)

    The threads in the sensor are parallel, but the correct pitch. Just run a 1/8 NPT tap in them until it bottoms out and you'll be able to thread in a pipe nipple.

    Pin 1: Vout
    Pin 2: Ground
    Pin 3: +5vdc

    If you don't want to tap into an existing +5vdc source you can make one on the cheap that works very well with a 7805 voltage regulator and a couple of capacitors that can be picked up at radio shack. The sensor has such a low current draw that a heat sink should not be necessary.



    Also, I have found these sensors that include a connector and pigtail that might work as well, I haven't used any of these so I don't know anything more about them.

    +/-1% FS
    http://www.ebay.com/itm/Pressure-tra...2a5694&vxp=mtr

    +/-2% FS
    http://www.ebay.com/itm/Pressure-tra...58eea8&vxp=mtr

    Both of these advertise 0.5v-4.5v linear outputs where 0.5v=0psi and 4.5v=100psi so if those are right the PID equation would be:

    Volts/.04 + (-12.5)
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    Last edited by Niemer; 12-02-2013 at 10:22 AM. Reason: Added connector info, updated PID config offset

  2. #2
    Senior Tuner LSxpwrdZ's Avatar
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    Verified to work? Wish I had seen this a few weeks ago... I dropped little over $100 for the autometer sensor.
    James Short - [email protected]
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  3. #3
    Advanced Tuner Niemer's Avatar
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    It's working for me.

  4. #4
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    A quick question about the autometer sensor. I am running it, but have issues with it almost reading too quickly. It's mounted at the back of the passenger rail, which my setup feeds into the back of the driver's side, crosses over in the front, then feeds the passenger side. What I'm experiencing is fluctuations almost like it's pulsing every time the #8 injector fires. Is there a way to slow down the sampling rate? I have a similar issue with my AEM wideband sampling to quickly as well.
    2000 T/A - Thompson Motorsports 416ls3, F1A procharger, HP tuned. Just a couple psi of boost.
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  5. #5
    Senior Tuner DSteck's Avatar
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    Use a capacitor.

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  6. #6
    Advanced Tuner Niemer's Avatar
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    Interesting, I'm seeing pretty much the same thing that The Alchemist is describing with this sensor. How do you determine the size of the capacitor required? And I'm assuming that it just goes inline with the sensor Vout signal?
    Ported TVS1900 OD cogs 10.5psi | ID850 | Vaporworx CTS-V 1:1 | COMP 219/233 .606"/.605" 113+1 | Ported TB | Pacesetter 1 3/4 LT | Solo Mach X3


  7. #7
    Senior Tuner DSteck's Avatar
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    Capacitors go in parallel. Sizing is not something simple to determine. You have to consider ripple, response time, the signal itself...

    A 10uf capacitor would probably suffice.

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  8. #8
    Senior Tuner LSxpwrdZ's Avatar
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    Yup I keep a couple various capacitors in a small drawer to slip into my circuit board/5v regulator to help smooth the signal back to the EIO. Mine being modular and using it on the dyno only I try to keep the sensor as far away as possible to injectors and moreso in the main feeding line just before the rail or after the rail in the regulator (if it has one).

    Most stock fuel systems are hard to read because of the lack of places to tap into the fuel system. So this is where I use capacitors to buffer/smooth the pressure pulse from the nearest injector.
    James Short - [email protected]
    Located in Central Kentucky
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    2020 Camaro 2SS | BTR 230 | GPI CNC Heads | MSD Intake | Rotofab | 2" LT's | Flex Fuel | 638rwhp / 540rwtq
    2002 Camaro | LSX 427 | CID LS7's | Twin GT5088's | Haltech Nexus R5 | RPM TH400

  9. #9
    Advanced Tuner Niemer's Avatar
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    I have updated the original post to include all the information needed to use this sensor. I also updated the offset of the PID equation based on testing I did comparing the output of the sensor to a mechanical gauge on my fuel rail and using the 7805 dc source.
    Ported TVS1900 OD cogs 10.5psi | ID850 | Vaporworx CTS-V 1:1 | COMP 219/233 .606"/.605" 113+1 | Ported TB | Pacesetter 1 3/4 LT | Solo Mach X3


  10. #10
    Tuner in Training
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    I just used this on my application and it works well.

  11. #11
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    I was thinking of wiring a cap in to clean up the signal. Just want to make sure I'm understanding the concept. If a 10uF is sufficient my approach would be attach the + lead to the wire going into the EIO and the other to the EIO ground. Or am I thinking of this wrong? Thanks in advance.

  12. #12
    Advanced Tuner Niemer's Avatar
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    That is correct, wire the cap in parallel.
    Ported TVS1900 OD cogs 10.5psi | ID850 | Vaporworx CTS-V 1:1 | COMP 219/233 .606"/.605" 113+1 | Ported TB | Pacesetter 1 3/4 LT | Solo Mach X3


  13. #13
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    Thanks!

  14. #14
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    Quote Originally Posted by tpy2kws6 View Post
    Thanks!
    Theres a much easier way to measure fuel pressure than mucking around with the EIO stuff,