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29 To connect your EFI fuel system to your crate or donor engine, a simple adapter fitting is all that's required. In this case, Aeromotive's OE quick connect spring lock to AN -6 adapter. The fitting simply slides into the stock 4.6L Three-Valve's fuel rail and locks into place when the garter spring snaps over the fuel rail's lip. An audible click/snap sound aids in the assurance of the fitting's retention.