I was working on similar project last week, it failed, not the mpg, but the way I got to heat up my fuel didn't work too well, but I think you're on the right track. I'll start my own project thread pretty soon, so far I've done 3 things, 2 worked, 1 not so good. Oh one more thing, heating up fuel on a fuel system that has a return line is not a good idea, because you'll be getting hot fuel back in the tank which is 1 will expand, causing your evap system to dump some of the fuel out ( you'll be loosing mpg), second the hot fuel will evaporate faster ( which is what we want, just not in the tank, once again you'll be loosing gas through evap system), and third of all like somebody said, hot gas is more ignitable, so might not be a good idea safety wise, almost forgot, 4th reason it's not a good idea is because electric fuel pumps use cold fuel as coolant to take the heat away from the pump. I am lucky, because I have a returnless fuel system on my car, all the gas stays in the line, and once it's pumped out of the tank it never goes back. So please be carefull.
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