Doohan driver started 11th for Virtuosi for Sunday’s race, lining up on the medium compound tyres to run the alternative strategy as the majority of the field opted for softs.
He made steady progress in the early stages, running ninth before the first safety car. A well-timed pitstop for softs under the second safety car meant he rejoined in second, behind Pourchaire, who had switched to mediums.
He finally took the lead two laps from the end on the Kemmel Straight, and despite a close moment between the pair at Les Combes, made it home to repeat his win in Hungary last weekend, with Enzo Fittipaldi third for Rodin Carlin.
Pourchaire’s second-place finish returns him to the top of the standings after title rival Vesti (Prema) crashed on the way to the grid, leaving him unable to start the race.
Pourchaire now leads by 12 points with three rounds remaining, with Vesti in second and DAMS driver Ayumu Iwasa - who retired early after sustaining damage in a clash - in third on 134 points.
Doohan’s win moves him 10 points ahead of Victor Martins (ART) in fourth and 38 off the lead.
With both Vesti and Martins spinning on the way to the grid, the start was delayed by five minutes, though the latter escaped with no damage.
The gap left by his team-mate gave poleman Ollie Bearman (Prema) a solid advantage off the line, with Pourchaire slotting into second ahead of Rodin Carlin duo Zane Maloney and Fittipaldi.
The safety car was almost immediately deployed after contact between Iwasa and Dennis Hauger (MP Motorsport) at Les Combes, the former suffering terminal suspension damage.
Hauger was push-started by the marshals, which resulted in him being disqualified as the rules state a driver cannot receive outside assistance while rejoining a race.
Source: Autosport