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

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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.
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Tape the threads to prevent fuel leakage:
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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:)
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Here it is all secure:
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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:
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Put some paper towels under the fitting to catch the fuel when you break the fitting loose:
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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:
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Attach the return line to the tee and reinstall the vacuum line if you removed it:
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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
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I cut the plug and soldered/heat shrinked the sensor plug to my engine harness:
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Now plug it up to your sensor:
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Reinstall the fuel pump rewire fuse if you pulled it:
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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!
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Now to set up the sensor to be logged.
Connect to your car and go to ECU Inputs:
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Now locate which sensor input your tapped into and select linear fuel pressure sensor and click "Save pin assignment":
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Click "Captured Values":
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Add linear fuel pressure to the captured values:
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Go to displayed values and add it to your displayed values:
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Start a log and right-click "LinFuelPress" and open preferences:
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Set your values up as per sensor specifications.. Mine was 0.5v = 0psi, 4.5v = 100psi:
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Now start your car or activate your fuel pump and start a log and make sure it's logging!:
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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!
http://www.facebook.com/MainStreetAutoandFabrication/
Main Street Auto and Fabrication
Located in Surgoinsville, TN.
We specialize in 4g63 powered vehicles.
 
Last edited:
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
Teflon tape (yellow tape made for fuel is preferred but this is what I had, hopefully it holds up.
You must be logged in to view this image or video.


Tape the threads to prevent fuel leakage:
You must be logged in to view this image or video.


Attach your FPS to the -6an tee and make sure it's tight.
I probably went a little overkill but it's not going to leak:)
You must be logged in to view this image or video.


Here it is all secure:
You must be logged in to view this image or video.


I removed the fuse from my fuel pump rewire and attempted to star 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:
You must be logged in to view this image or video.


Put some paper towels under the fitting to catch the fuel when you break the fitting loose:
You must be logged in to view this image or video.


Attach the tee to the AFPR as so(I positioned the plug at a 45* angle towards the firewall):
You must be logged in to view this image or video.


Attach the return line to the tee and reinstall the vacuum line if you removed it:
You must be logged in to view this image or video.


Now you're going to wire in your sensor.
It requires 5v which is only pin 81 n 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):
You must be logged in to view this image or video.


I cut the plug and soldered/heat shrinked the sensor plug to my engine harness:
You must be logged in to view this image or video.


Now plug it up to your sensor:
You must be logged in to view this image or video.


Reinstall the fuel pump rewire fuse if you pulled it:
You must be logged in to view this image or video.


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!
You must be logged in to view this image or video.


Now to set up the sensor to be logged.
Connect to your car and go to ECU Inputs:
You must be logged in to view this image or video.


Now locate which sensor input your tapped into and select linear fuel pressure sensor and click "Save pin assignment":
You must be logged in to view this image or video.


Click "Captured Values":
You must be logged in to view this image or video.

Add linear fuel pressure to the captured values:
You must be logged in to view this image or video.


Go to displayed values and add it to your displayed values:
You must be logged in to view this image or video.

Start a log and right-click "LinFuelPress" and open preferences:
You must be logged in to view this image or video.



Set your values up as per sensor specifications.. Mine was 0.5v = 0psi, 4.5v = 100psi:
You must be logged in to view this image or video.


Now start your car or activate your fuel pump and start a log and make sure it's logging!:
You must be logged in to view this image or video.


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]

Find us on Facebook!
Main Street Auto and Fabrication
Located in Surgoinsville, TN.
We specialize in 4g63 powered vehicles.


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

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:
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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