I have my doubts about such a device. Fuel, especially in a diesel, is a whole lot less mass than the air. In other words, if you squirt fuel that's one part mass to 14 parts of the mass of the air, or leaner, the fuel is going to change to the temperature of the air almost imediately.
This is how a diesel runs. The fuel isn't heated until it hits the hot air. The air heats the fuel spray instantaenously causing it to burn.
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