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Fuel cooler?

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Old Oct 7, 2015 | 08:51 AM
  #1  
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Fuel cooler?

Ok, So I was watching Powernation and their 80's chevy truck build with a duramax and saw something interesting.....

The put a tranny cooler on the fuel return line to cool the fuel returning to the tank....

Now I see where this is helpful on a gas vehicle (not that there is a fuel return line in that application) but how does that help a diesel?

I understand if you pressurize fuel it gets hot and then returning to the tank heats up the fuel in the tank....

But with fuel gel issues why would you risk this?

Wouldn't warmer fuel flow better, atomize better, ignite better, and burn better?

I would think cooling it down would potentially cause slower burn thus increasing egts? Maybe I am wrong?
 
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Old Oct 7, 2015 | 10:55 AM
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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.
 
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Old Oct 7, 2015 | 11:04 AM
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Originally Posted by madpogue

How much does it reduce the temperature?

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.
Great questions...

Maybe I will submit it to powernation and ask....
 
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Old Oct 7, 2015 | 02:55 PM
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Hot fuel is less dense (it expands), therefore it contains less energy than more dense cold fuel.
 
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Old Oct 7, 2015 | 05:03 PM
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Actually there was a cooler originally.my old boss's 04 had one anyway
 
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Old Oct 7, 2015 | 05:19 PM
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Also the cp3 high pressure fuel system prob really heats the unused fuel up ALOT!
 
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Old Oct 7, 2015 | 09:08 PM
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Originally Posted by fordman67
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?
 
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Old Oct 7, 2015 | 10:14 PM
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IMHO its not an issue on our trucks at the relatively low pressures.
 
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Old Oct 7, 2015 | 11:26 PM
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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?
 
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Old Oct 8, 2015 | 08:45 AM
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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.
 
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