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Sounds like a gimmick to me. How much does it reduce the temperature? Since it's return fuel, which goes to aprx. the middle of the tank, and the supply fuel comes from the bottom of the tank, how much does it reduce the temperature of the fuel that gets supplied to the engine? And why would you cool the fuel on the return, only to heat it in the filter bowl?
I wonder how hot our fuel gets in the first place.
Also the cp3 high pressure fuel system prob really heats the unused fuel up ALOT!
So do you think it is less of an issue with our trucks as a result of the pressure being built in the injector and then used...where as the Duramaxes and cummins have higher pressure fuel systems?
This is a wild guess, but I wonder if it doesn't minimize evaporation in the tank? Hotter fluids evaporate more readily than cooler fluids. So an emissions thing, maybe?
To be effective a fuel cooler would need a bypass system to prevent the fuel from over cooling. Diesel fuel doesn't like cold. I think all fuel specifications are rated at 60 degrees F.