I've had my 2013 duramax for several months and just put an edge tuner on. I'm not sure what kind of power to expect since this is my first diesel, but I've always thought that the truck ran sluggish as if it never really warmed up. I happened to run across the fuel temp gauge on my tuner and it says that the fuel temp is 32 F and it's 90 outside. Could this cause performance issues?
Fuel temp too low???
- Thread starter Duranali
- Start date
Just a thought, are you sure it is reading F not C? Because 32C is equivalent to 89.6F. I am not sure about yours, but in the tuning for my LBZ I believe I saw a table related to fuel temp. I am an EFI user and have admittedly never had my hands on an edge, but maybe check to see if there is any way to check if it is set to C or F in the tuner.
There is most defiantly tables that limit/change fueling based on fuel temp. If you unplug it does it change? Bet you need have a back sensor
Yes, no resistance is gonna read like 302F, open circuit -40F. So unplug and check it.
Sure sounds like a faulty sensor, or the edge is providing false info..
Sure sounds like a faulty sensor, or the edge is providing false info..
Coud be a bent or unseated pin in the edge bale connectors if your edge has them? Causing low reference voltage. Remove the edge and see what it is doing with a scanner or tech II...
Idk about lml. But they used to have them on the Ds rear of the rail. They are tied into the return side.
It's going to the dealer, but I would like to simply unplug the sensor to see if there is a change in the reading. That way I have a better idea of what the problem is. I don't have a lot of faith in warranty mechanics.
Still haven't found the fuel temp sensor but I've got a problem that may be related. It doesn't happen every time, but I am lose fuel rail pressure under full throttle. If I continue to hold the throttle, the pressure comes back and it accelerates again. It's never done it running the stock tune, but maybe I need to change the fuel filter? The truck is only a few months old though.
Sent from my iPhone using Tapatalk
Sent from my iPhone using Tapatalk
What pressure do you see it hit before it falls off?
There is a fuel pressure bypass valve in the back of the drivers side fuel rail that will pop open if you exceed it's rated spring pressure. Being it's fine in stock tune, betting that's it. Block off unit cost like $35 at PPE. Fuel filters typically don't recover if you hold the throttle open...
The fuel temp sensor is on the drivers side near the rear of the engine between the valve cover and fuel rail. Located in the smaller fuel return line, near where the plastic lines from the injectors connected to it.
Hope that helps
There is a fuel pressure bypass valve in the back of the drivers side fuel rail that will pop open if you exceed it's rated spring pressure. Being it's fine in stock tune, betting that's it. Block off unit cost like $35 at PPE. Fuel filters typically don't recover if you hold the throttle open...
The fuel temp sensor is on the drivers side near the rear of the engine between the valve cover and fuel rail. Located in the smaller fuel return line, near where the plastic lines from the injectors connected to it.
Hope that helps
The pressure gets to around 24k and then drops to 4. Thanks for the info on the temp sensor. I'll give that area another look.
BTW, after it does it once, it seems to fine, meaning it doesn't lose pressure under full throttle again until the next time I run the truck.
Sent from my iPhone using Tapatalk
BTW, after it does it once, it seems to fine, meaning it doesn't lose pressure under full throttle again until the next time I run the truck.
Sent from my iPhone using Tapatalk
Last edited:
Sounds to me like ya need one of these..
http://www.pacificp.com/store/index...oducts_id=54&zenid=j7g3gn1uk190q7rolbh15l1v91
Basically it's a plug that takes the place of the fuel pressure bypass valve. The tune your running is probably spiking the fuel pressure quickly, and thus popping the valve open. Since it's fine at stock, betting that's the issue.
http://www.pacificp.com/store/index...oducts_id=54&zenid=j7g3gn1uk190q7rolbh15l1v91
Basically it's a plug that takes the place of the fuel pressure bypass valve. The tune your running is probably spiking the fuel pressure quickly, and thus popping the valve open. Since it's fine at stock, betting that's the issue.