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Originally Posted by R.I.D.E.
I used the unnecessary AT cooler portion of a replacement radiator as an oil cooler for the engine on one of my cars, maybe use that for your fuel heater, but you also might consider putting a fuel cooler before the return hot fuel gets to your fuel tank.
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Nice idea but won't work for all cars. In my car the lower half of the radiator and the return hose to the engine is cool to the touch even after hard highway miles. The heat that probably is in that water is mostly due to the transmission cooler.
What about using heat pipes like computers use? You could even connect those to the exhaust system and get faster heat up times since the heat pipe will only get to a certain temp before the water inside completely vaporizes and it no longer transfers heat.
I would be worried about doing this mod on a car that isn't a 'return free' fuel system. A full tank of gas at ambient heated to 160 could very well cause the fuel to expand beyond the capacity of the tank(probably more of an issue when you fill the tank and it's 17 degrees outside). On a return free fuel system the fuel also moves slower and will heat up better.
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