Adjustable Billet Fuel Pressure Regulator (4.5 to 9 psi). Edelbrock Part Number 8190 Yogi’s Part Number. Fuel Pressure Regulator #8190 is for carburetor applications that require consistent pressure from 4.5 to 9 psi. It features two 3/8″ NPT outlets, one 3/8″ NPT inlet and is adjustable from 4.5 to 9 psi. This regulator is manufactured […]