#HF300 Ford 300 CID TBI Conversion Kit - Howell EFI Very popular for older street-driven vehicles or 4 wheel drive vehicles. Contains all sensors, components, wiring harnesses, ECM and fuel pump to install fuel injection on your engine. Custom calibration PROM for your engine. ECM installs under dash. Fuel pump installs in main fuel line, and bypass fuel is returned to the tank. Ford Multiport EFI Wiring Manual - Vintage Bronco Ford Multiport Electronic Fuel Injection Wiring Manual. This is the 25 page manual Ford supplies with their Electronic Fuel Injection Main Engine Harness kit. Copies can be purchased directly from Ford Racing Performance Parts. For more information call: 810-468-1356.