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 from billet aluminum and features a Nylon-reinforced nitrile diaphragm for excellent heat and leak resistance. Has been in the business of providing classic car and street rod parts and accessories for over 40 years. This means you get it faster! WARNING: This store sells products that may contain chemicals which are known to the state of California to cause cancer, birth defects, or other reproductive harm.