NOVELTY - The fluid catalytic cracking (FCC) unit comprises a first mixed feed stream, a slurry pump and/or mixer, a second feed stream, a FCC riser, a reactor/stripper, and a regenerator. The first mixed feed stream comprises a solvent stream and a biomass feed stream comprising a biomass feedstock. The slurry pump and/or mixer is configured to transport the mixed feed stream to a riser. The second feed stream contains a conventional FCC feedstock.    USE - The fluid catalytic cracking unit is useful for upgrading biomass to fuel products including upgraded pyrolysis oil, gasoline, light cycle oil, light gases, #6 fuel oil, decant oil, naphtha, raffinate, cyclohexane, n-hexane, kerosene, diesel, fuel oil, methane, ethane, ethylene, propane, propylene, mixed butanes and/or petroleum coke (all claimed).    ADVANTAGE - The fluid catalytic cracking unit economically upgrades the biomass to the fuel products with high stability.    DETAILED DESCRIPTION - The fluid catalytic cracking (FCC) unit comprises a first mixed feed stream, a slurry pump and/or mixer, a second feed stream, a FCC riser, a reactor/stripper, and a regenerator. The first mixed feed stream comprises a solvent stream and a biomass feed stream comprising a biomass feedstock. The slurry pump and/or mixer is configured to transport the mixed feed stream to a riser. The second feed stream contains a conventional FCC feedstock. The first mixed feed stream and the second conventional FCC feedstock meet with regenerated catalysts for catalytic cracking and upgrading in the FCC riser. The reactor/stripper is configured for separating upgraded fuel products from the deactivated FCC catalyst. The regenerator is configured to regenerate deactivated catalyst to regenerated catalyst, where long chain petroleum compounds and biomass are upgraded to fuel products in the FCC riser. The biomass feedstock contains wood, paper, crops, animal fats, plant oils, biological waste, and/or algae. The solvent comprises pyrolysis oil, conventional FCC feed, heavy vacuum oil, atmospheric distillation bottoms, coker gas oil, hexanes, naphthas, light cycle oil, heavy cycle oil, fuel oil, decant oil, raffinate, cyclohexane, n-hexane, kerosene, diesel, water, steam, alcohols, and/or polyols. The mixed feed stream is injected at locations from the bottom of the riser, three quarters , 2/3, one half , one quarter along the riser, or at a top of the riser. The riser contact time is 0.1-4 seconds including 0.2, 0.4, 0.6, 0.8, 1.0, 1.25, 1.5, 1.75, 2.0, 2.25, 2.5, 2.75, 3.0, 3.5 and/or 4.0 seconds based on mixed feed stream injection locations and rate of flow in the riser. The FCC riser is fed with the conventional FCC feedstock and the mixed feed stream in a ratio consisting of: 99:1 FCC feedstock to mixed feed stream; 49:1 FCC feedstock to mixed feed stream; 20:1 FCC feedstock to mixed feed stream; 10:1 FCC feedstock to mixed feed stream; 9:1 FCC feedstock to mixed feed stream; 8:2 FCC feedstock to mixed feed stream; 7:3 FCC feedstock to mixed feed stream; 6:4 FCC feedstock to mixed feed stream; 5:5 FCC feedstock to mixed feed stream; 4:6 FCC feedstock to mixed feed stream; 3:7 FCC feedstock to mixed feed stream; 2:8 FCC feedstock to mixed feed stream; and 1:9 FCC feedstock to mixed feed stream. The mixed feed stream comprises 0.1-90% biomass with 99.9-10% solvent including a mixed feed stream consisting of: 5% biomass with 95% decant oil and conventional FCC feed as a solvent; 10% biomass with 90% conventional FCC feed as the solvent; 20% biomass with 80% conventional FCC feed as the solvent; 30% biomass with 70% conventional FCC feed as the solvent; 50% biomass with 50% pyrolysis oil as the solvent; 25% biomass with 75% decant oil as the solvent; 50% biomass with 50% decant oil and pyrolysis oil as the solvent; 90% biomass with 10% naphtha as the solvent; 70% biomass with 30% decant oil and conventional FCC feed as the solvent; 30% biomass with 70% decant oil and pyrolysis oil as the solvent; 50% biomass with 50% conventional FCC feed as the solvent; and 50% biomass with 50% pyrolysis oil and conventional FCC feed as the solvent. An INDEPENDENT CLAIM is included for a method of upgrading biomass to fuel products.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of a FCC unit.