I was looking at all the different gauges on my edge juice cts2, I noticed my fuel temperature was around 100 degrees. Is this normal, that seems a lil high to me...

 

I believe the specification for the fuel heater inside the filter canister is that it's turned on at 40º and off at 70º. The IP will raise the fuel temp all on it's own to above 100º, so your temperature is not out of ordinary.

 

What you are seeing is the fuel temp as it goes through the vp44 injection pump not the fuel filter canister fuel heater. 100 is not bad. It will go up a lot higher than that in the summer time. The lower the fuel level in the tank, the longer you are driving the higher it is going to get. IIRC the engine will not derate until something like 165. I have seen in the 130s on a hot summer day driving a few hundred miles.
The vp44 heats the fuel due to the pressure and due to engine heat. something like 80% of the pumped fuel is returned to the tank as the vp uses it to cool itself. So the longer the truck is driven the more warm/hot fuel is returned to the tank and then the hotter the fuel is start with before it even gets to the vp. The lower the level of fuel in the tank the faster it warms up. In the dead of winter at 0 or below deg I think I have seen fuel temps in the mid seventies with a relatively full tank and a hundred mile run.

 

Everyone is correct. The fuel heater in the fuel filter housing shuts off at 70* but the fuel will continue to warm as the engine runs simply because of the heat generated by the injection pump and the fuel passing through the VP and injector return runs back to the fuel tank. So the real only heat dissipation takes place in the fuel lines and fuel tank, and for this reason its advised to not run the fuel down to minimal tank levels in the warm weather. Meaning, try to not let it go below 1/4 tank. Not something to be concerned with in the cooler weather though.....

Its very common for diesel fuel to get hot. In some diesel applications the fuel can get so hot that it will do whats known as "asphalting", whereby the fuel literally turns to black goo. Because algae is a problem in diesel fuel that contains water, some people mistake the goo in their tank for algae but it can also be asphalting fuel from extremely hot fuel temps.

There are plenty of diesel applications which run fuel coolers for this reason but for whatever odd reason these Dodge trucks dont seem to need one. People have tried them but I honestly cant say whether or not they offer any advantage either. I've even considered trying one just to help keep the VP cooler because when fuel temps reach 160* the VP will run in limp mode. Yes, there is a fuel temp sensor in the VP. I would say there's probably no reason for concern until the fuel temps get closer to 160*.

 

hey thank you to everyone!