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Just like a turbo car where the air is pressurized, in efi cars the fuel lines are pressurized to 40-50 some psi.
So, if i decided to run an intercooler like setup, say, an oil cooler, but run fuel through it from the pump to the rail, would my fuel get cold enough to make a difference?
Just exploring ideas of efficiency, searched google and practically no one has done this

 
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you would not notice a difference.

 
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The temperature of the fuel in the fuel lines makes little difference if your fuel pump is in the tank. Fuel temperature used to be important when cars had carbs and the fuel pump was located at the engine. You may have heard of vapor lock, this happened when the gas evaporated in the fuel line and the fuel pump ended up pulling vapor instead of liquid. Vapor lock was caused by getting winter blended fuel in warm weather which would evaporate too easily, running a fuel line too near the exhaust and having the fuel pump suck fuel instead of push fuel causing a drop in vapor pressure. Putting the fuel pump in the tank and increasing the pressure decreases the possibility of vapor lock.

From a performance standpoint, fuel has to evaporate to burn so if you were able to inject cold fuel it would be similar to starting your car on a cold morning where the mixture has to be enriched so that enough fuel evaporates to support combustion. In other words you would burn more fuel for the same or less power.

 
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and here i am thinking ive heard it all. llol

 
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The fuel in the tak is not a heat problem. The fuel returning to the tank is cooled before it in this type of system. Manufacturers do it NOT for performance gains, but for emmisions. Even at that, most returned fuel systems are on diesels, the return fuel from the injectors all the time, so theres on super heat, they also have a fuel injection pump or a high pressure pump to heat it up. The intermediate pressures on them are sometimes upto 5000 psi too, not 50. The return fuel in a gasser isn't that hot to begin with, and any power gains it may net would be negligable....

 
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Why the mojo would u want to cool ur fuel when u are going to burn it right back up?

Hhajahahahaa

 
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i did hear about heating the fuel for better mpg, dont know how good the gains are.

 
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I hear putting magnets in ur fuel line makes u burn fuel cleaner...and makes vteck kick in


Yo

 
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Like I said in the above post, it is more for emissions than hp any lower temperatures for combustion = less nitrous oxides. Same principle as an intercooler. For every 1 degree you drop the intake charge its 2 for combustion temps.... Have no idea about mpg with heat, but that makes absolutely no since at all.

 
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Hey man this is a civic forum. No return fuel lines lol

 
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I know, just responding to the poster that asked about the hot fuel in the tank...

 
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So to summarize, don't buy it. It's not worth it.