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The whole using pressure in the tank makes some sense to me(other then the whole vapor+oxygen=explosion part) from what I understand having higher pressure in the lines will help with atomization of the fuel by causing the injectors to spray a finer mist. If you use a compressor it actually would require less power to pressurize the fuel system because the air at 35psi would expand to maintain a reasonable pressure therefore reducing some of the load on the alternator. However the tank would have to be sealed and I'd use nitrogen instead of a compressor to avoid exploding!! If you had a 10 gallon air tank in the trunk with nitrogen gas at 150psi and the fuel tank pressurized to say 35psi you wouldn't need a fuel pump at all.
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