The O2 sensor is one of the few remote harness leads. The main harness from the throttle body to the ECU signals the injectors and has a majority of the sensors built in. Even the coolant temp sensor lead travels through the throttle body to ease installation.The throttle body is set up just like a typical 4150-style carburetor, and it has the typical flanges on it, as well. The throttle linkage also matches a typical carburetor setup to make it easy to hook up your throttle, transmission kick-down, or any other standard connecting points.We’re also installing a new fuel cell to replace the archaic spun aluminum tank previously located in the Camaro’s trunk. Combined with the FAST in-line fuel kit, we will have a recirculating fuel system to feed the throttle body and use a return system to the new cell. The EZ-EFI can be fueled in two different manners. It can either be utilized as return style or returnless. The recirculating system will keep the fuel cooler. The recirculating fuel system for the FAST EZ-EFI also runs at 43 psi instead of about 6 psi for a carburetor.
What appear to be carburetor float bowls on the throttle body actually house four 74 lb/hr high-impedance injectors in the front and four in the rear that can supply enough fuel for 1,200 horsepower and flowing 1,150 cfm. The fuel circuit travels around the two fuel fittings. We plumbed the inlet to the throttle body from our fuel flow sensor and out of the throttle body back to our FAST fuel pressure regulator. From there, a return line travels from the regulator back to the fuel tank.Though you can run the fuel system similar to a single or dual carbureted inlet with the fuel pressure regulator mounted upstream from the throttle body, with this FAST system alternatively you can run in one side and out the other and then back to a return-style regulator and ultimately return to the fuel tank.One important accessory included in the kit is a junction block to mount the fuel pressure sensor. It needs to be located on the pressure side of the system to feed fuel pressure data to the ECU.