Neymar earned a yellow card for yet another dive.
With a slight touch with his right foot, Neymar pushed the ball to his left just past Tamacas, who looked to have gotten a bit of the forward right leg. Neymar fell to the ground.
Jair Marrufo, one of the American referees at this year's World Cup, gave Neymar the yellow card in the 44th after the forward attempted to dribble past defender Bryan Tamacas.
Neymar converted a penalty kick for the second straight game and assisted on three goals before a crowd of 28,511 at FedEx Field.More news: These Photos of Hurricane Florence From Space Are Mind Boggling
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Head coach Tite responded to Donald Trump's comments that Brazil had a "little problem" in the summer by informing him how many World Cups they had won.
"It is an honour to be back winning and making goals and playing with my team-mates as best as possible".
'I am delighted to get two goals and for the chance that coach Tite gave me, ' Richarlison said. With 59 goals in 92 worldwide appearances, he is third in Brazilian history behind Pele (77) and Ronaldo (62).
Richarlison curled home Brazil's second after 16 minutes before Philippe Coutinho added a third before half-time.
Neymar did convert a fourth-minute penalty to put Brazil in front against El Salvador following a foul on debutant Richarlison, who went on to score twice in the rout. "We had a level of attacking situations with possession of ball that translated into a good performance", he told his post match press conference.