Assume you mean the D81 connector, I can't find a D91 on the diagram.
If the fuse doesn't blow with D81 disconnected, the the short must be between D81 and one or more injectors, or could be an injector shorting internally.
Check the wiring for any signs of damage or crushing. If none found, reconnect D81 and disconnect all the injectors. Reconnect them one at a time to find the injector or wire that blows a new fuse.