Holley 12-803BP Holley bypass style fuel pressure regulator for carbureted engines. Used in systems with a return line back to the fuel tank. Provides longer life for electric fuel pumps. Allows the electric fuel pump to run quieter. Preset to 7 psi. Adjustable from 4 1/2 to 9 psi. One inlet and one outlet port. One bypass port to return fuel to the gas tank. All ports are 3/8" NPT. Holley 12-803BP bypass fuel pressure regulator EFI to carb fuel pressure regulator HOLLEY-12-803BP Fuel regulators for use with carburetors. HOURS: 11:00 am to 6:00 pm Monday - Friday Eastern Standard Time We welcome CANADIAN customers! For ordering information, click on "Orders To Canada" at the top left side of this page. We will not ship to freight forwarding - expediting companies. PAYMENT METHODS: PayPal, Visa, Mastercard, Discover, American Express, money orders.