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Usually liquid-air intercoolers have a radiator or heat exchanger to reduce the temperature of the coolant. Otherwise, as you drive the temperature of the liquid coolant would steadily increase ie the temperature in your fuel tank would keep going up with no where for it to go. If you had relatively small fuel loads this could heat up quite rapidly.
Cooling usually requires a large surface area to cool eg a cooling surface. I'd think that in a vehicle this could present some packaging as well as safety issues.
Also heating your fuel presents problems with vaporisation issues and also reduces the density of the fuel being injected.
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