The boiling point of #2 fuel oil is 340F - 675F at atmospheric pressure. At 60 psi gauge pressure, it is substantially higher. Boiling doesn't introduce air to anything; it vaporizes the liquid. When the vapor cools to below its boiling point, it condenses to its original liquid state.
Boeing 747-400, Early '99 F350 4x4 std. cab, 225k mi.
1995/Late 1999 Frankenmotor engine installed . . .
2326 Air Filter, NAPA 4911 fuel pre-filter (Stanadyne FM100), 2 cent mod . . .