2nd Gen Non-Engine/Transmission edge juice/attitude fuel psi reading?

[samsonite01]

Hi everyone. Newb. Bare with me.

I have the edge juice/attitude on the truck. I have the cts display set to read my fuel psi among other things. The psi reads 34 most of the time. Just as the weather started turning i noticed the reading fluctuating weird. It would start dropping slowly all the way to 0 then back up to around 15 then down and back up to 34. Well i figured i would change the fuel filter and se what happens. Well... system wouldnt reprime due to a lift pump failure. So i purchased a new pump and a fuel psi tester gauge. Installed the pump, tested and adjusted psi at the injection pump. 19 psi at idle. (Adjustable raptor 100 DDRP) Well low and behold the cts gauge is still doing the same thing, psi going up and down random but mostly reading 34.

So first question is how and where dose the edge take its reading from? Second why is the psi fluctuating randomly? Is it a sensor problem? Why dose it read 34 when my tester gauge reads 19? I know the old pump was bad. Lucky i found it before sudden vp44 death. I have turned the tuner to level 5 when the psi was reading 0 and hammer the throttle to see if she laggs but no, lotts of smoke, lotts of go fast. What am i missing? Deisls are new to me, i have only had the truck for few months now. I am mech inclined well enough to figure things out but im stumped here. I really need to install a mech gauge in the cab so i can see the psi all the time. Dose my fuel tank have another pump on it? Whats funny is i want to blame it on the cold somehow.

Thank you and i hope i posted this in the right place.

Oh. And im puttin a mech pump on when i can afford one!

 

[JR]

Most likely your fuel pressure sensor is bad.I'm not familiar with what the sensor looks like but It should be either threaded into a port on the fuel filter canister somewhere and have a wire coming off of it, or possibly a banjo type. Look in the area of the fuel filter canister or possibly even right before the VP and once you find the wire you should be able to trace it back to the EDGE.

If your talking about the fuel pressure fluctuating when you first start the truck, it could very well be related to the cold. Your grid heaters will cycle on and off until the truck warms up which consumes a lot of voltage. If the fuel pressure fluctuates right along with the voltmeter when you first start the truck with a cold engine, everything is perfectly normal. It should not be fluctuating when the engine is warm.

 

[samsonite01]

Most likely your fuel pressure sensor is bad.I'm not familiar with what the sensor looks like but It should be either threaded into a port on the fuel filter canister somewhere and have a wire coming off of it, or possibly a banjo type. Look in the area of the fuel filter canister or possibly even right before the VP and once you find the wire you should be able to trace it back to the EDGE.

If your talking about the fuel pressure fluctuating when you first start the truck, it could very well be related to the cold. Your grid heaters will cycle on and off until the truck warms up which consumes a lot of voltage. If the fuel pressure fluctuates right along with the voltmeter when you first start the truck with a cold engine, everything is perfectly normal. It should not be fluctuating when the engine is warm.

So what would explane the psi reading on the edge be different than what the test gauge says?

 

[JR]

The Edge takes it's reading from a pressure sensor which is what I described above. It is likely bad. I would contact Edge about a replacement.

It should look something like what is in the link. Check to make sure it is the correct fitment for your Edge, I am not familiar with them I just posted the link for an example. You could shoot Edge an email and describe your problem and ask them what they think before you buy it but this is most likely your problem.

http://www.cumminsperformanceparts.com/easprse98.html

 

[BarryG]

Well with an 01 the edge has to have its own fuel pressure sensor as there is not one on truck elsewhere for it to read from like some of the other parameters it is reading through the ecm. As JR mentioned I also would think the sensor since it doesn't match the test gauge. The attitude portion of the edge setup is probably under the hood quite possibly on top of the PDC as that seems to be a very common place to set them (next to driver side battery on the firewall side) it is a little black box (1x3x4 or so) with some cables/wires coming out of it. One of those cables/wires is going to a pressure sensor in the fuel line. Should be between the fuel filter and the VP44. Follow the wires one at a time and you will find it. I doubt edge will give the electrical specs for the sensor but if they will you might be able to test it to see if it is good. One thing on the vp trucks is the pressure does vary due to the hammering effect of the vp most mechanical gauges don't react fast enough to notice it but some electrical sensors can. I know I had an SPA Technique gauge that was very accurate and it could sense the modulation but it also had a function that you could average the reading over a period of time. I do not know how the edge sensor works I know it doesn't have the averaging function. However it reading 34 and your test gauge reading 19 is way more than the hammer effect of the vp.

 

[samsonite01]

Thank you for the help. I will find the sensor and mess around with it. New sensor will have to be order from edge i assume.

I will post my conclusion soon.

 

[samsonite01]

Holly expensive! Thank you for the link as well!....just read it

 

[BarryG]

My edge j/a does not have the eas stuff for the fuel pressure gauge it is one of the supplied wires coming out of the box. So you may be able to get just the sensor and not the harness etc so hopefully it is cheaper.

 

[samsonite01]

Ah... that explains it. I didnt see any sensor on the fuel lines when changin the lift pump. I looked agian last night and couldnt see anything. More research! What are the two plugs that come of the filter housing? I know ones the water in fuel. Whats the other?Thank you agian for the help.

 

[JR]

Fuel heater.

 

[samsonite01]

Good place for factory service manuals. Want to buy. Not downloaded pdf.

 

[JR]

Ebay is probably your best bet. A genuine factory service manual will likey cost you at least $100-$150. Complete sets with the body and chassis supplements will be double that. I bought a CD, downloaded it and printed out the main chapters that I look at frequently and put it in a 3 ring binder. I think the CD cost less than 20 bucks.

 

[samsonite01]

Well, finally got around to the fixin. Thank you JR and BarryG. It was the edge sensor as explained. Bought new, installed and fixed. Edge pres. reads 19 at idle and 12 to 15 at wide open.