Why cool your fuel? - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 13 (permalink) Old 12-21-2009, 01:22 AM Thread Starter
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Why cool your fuel?

I noticed lately that some people are cooling their diesel fuel. I know in a gasser that is a good thing and helps performance. But I was under the impression it is better to heat your diesel fuel. Was I taught wrong? What are the benefits of installing a fuel cooler on your diesel powered vehicle?
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post #2 of 13 (permalink) Old 12-21-2009, 04:17 AM
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where did you see a fuel cooler ? . . . I never heard of such a thing Gas or Diesel !
I have seen Fuel heaters on many diesel's . . .

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post #3 of 13 (permalink) Old 12-21-2009, 03:07 PM Thread Starter
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I know an old racer trick was to cool the gasoline. But I have seen in both the magazines and on every day trucks some people are cooling their deisel fuel. I am not sure why.
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post #4 of 13 (permalink) Old 12-21-2009, 09:23 PM
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Sounds backward to me. . .heat diesel. . .Cool gas

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post #5 of 13 (permalink) Old 12-21-2009, 09:27 PM Thread Starter
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That is how I always thought it should be.
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post #6 of 13 (permalink) Old 12-21-2009, 11:02 PM
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If you are looking to get additional HP from a diesel you cool the return fuel. On my Duramax it has a stock fuel cooler. There are fuel heaters on diesels to slow down waxing of the fuel when it is cold out. Go to a fuel stop and feel the tank of a class eight, fuel over 140 F you loose power.

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post #7 of 13 (permalink) Old 12-21-2009, 11:07 PM Thread Starter
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It sounds like I will be leaving my fuel system alone in this area. I was planning on installing a fuel heater becuase I thought it would help the fuel combustion. But I guess that only time it would do any good is winter time and that depends on where I am living.
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post #8 of 13 (permalink) Old 12-26-2009, 02:09 PM
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The only way I see it, cooling any fuel, is to save if from evaporation because of a hot environment. A cooler fuel temperature (cooler than a hot environment) keeps fuels denser. If the engine runs hot, slightly cooling a fuel will only delay the vaporization process some amount, which ever that amount may be. If this amount is too long when injected, the power stroke will not produce the BTUs needed for efficient torque production. Gasoline or diesel.

Cooling it while returning back to the tank saves further possible evaporation.

Can a fuel be over-atomized while being injected or fed into the engine by a carburetor, yes. If the fuel is heated too much its effect is similar too cool condition. The fuel (in a cool state) could not ignite, or just berely ignite. You could (in a hot state) get pre-ignition, if the diesel fuel evaporates quicker than normal during the injection period, which I am sure is under weird circumstances with diesels. Hot spots caused by carbon buildup can cause combustion problems as well.

You could view post-combustion as a too cold situation when you first start a rig up at 0 degrees or any other really cold temperature. This late combustion is the result of the fuel heating up too slowly (too cold in the first place) and then igniting. The off sounding engine and white smoke tell the story until the engine is at operating or close to operating temperature.

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post #9 of 13 (permalink) Old 12-26-2009, 02:12 PM Thread Starter
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Those are very good points. Thanks.
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post #10 of 13 (permalink) Old 12-26-2009, 05:08 PM
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go to the heavy duty section there is very good thread about fuel coolers on the big rigs. It makes a huge differnce on them.

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