NOVELTY - The method involves partially stabilizing a first portion of biomass-derived pyrolysis vapors (1) by reacting the pyrolysis vapors with a catalyst (3) to produce stabilized pyrolysis vapors that are less active for oligomerization and polymerization. The stabilized pyrolysis vapors are combined with a second portion of the pyrolysis vapors at temperature and pressure sufficient for molecules of the combined vapors to react and produce hydrocarbons having molecular weights that are within a boiling range of one of gasoline, diesel and gasoil and used as hydrocarbon transportation fuel.    USE - Process for producing biomass-derived hydrocarbon fuel. Uses include but are not limited to gasoline, diesel, gasoil and kerosene.    ADVANTAGE - The process enables improving fast pyrolysis technology to allow rapid stabilization or upgrading of raw pyrolysis vapors so as to prevent uncontrolled polymerization, while allowing intermolecular addition reactions to proceed, and hence efficiently producing hydrocarbons having molecular weights and characteristics fungible with current hydrocarbon transportation fuels, while simultaneously preventing char and associated catalyst poisons from contacting upgrading catalysts that convert primary products. The process enables removing and optionally recycling large majority of char and heat carrier fall together into a char catch to, so that the char is prevented from becoming entrained in the pyrolysis vapors exiting through an outlet and prevented from entering a downstream upgrading reactor and coming in contact with an upgrading catalyst bed. The process enables providing the upgraded product comprising bio-derived fuel based upon exiting a final upgrading reactor, so that a fuel component or upgraded fuel intermediate can be directed to a condensation system that reduces product temperature to temperature that is at or below a dew point for a component of the product, thus allowing the biofuel or upgraded fuel intermediate to condense to liquid.    DETAILED DESCRIPTION - The pyrolysis vapors comprise aromatic monomers, furan monomers, anhydrosugar monomers, olefins, alcohols, aldehydes, carboxylic acids, ketones, ethers, esters and hydrocarbons.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic block diagram of a structure for producing biomass-derived hydrocarbon fuel.    Biomass-derived pyrolysis vapors (1)    Upgrading reactor (2)    Catalyst (3)    Stream (4)    Reaction zones (7)