FAST Fuel Injection System Wiring Harnesses - Free Find FAST Fuel Injection System Wiring Harnesses and get Free Shipping on Orders Over $99 at Summit Racing! FAST 30308 - FAST EZ-EFI 2.0 Replacement Main Wiring Harnesses. Compare. Main Wiring Harness, EZ-EFI 2.0 Replacement, Throttle Body Injection Style, Universal, FAST, Each efi wiring harness | eBay Find great deals on eBay for efi wiring harness. Shop with confidence. Skip to main content. eBay Logo: Shop by category. FAST EZ-EFI 2.0 Replacement Main Wiring Harness 30308. Summit Racing - FAST Shipping - 60 Day Return Policy. Brand New. $320. Buy It Now. Free Shipping. Watch.