If the tank is not completely clean and free of impurities and rust, the coating will not affix to the metal and will detach. It will then be pulled into the fuel line, blocking the fuel filter. In some instances, the coating material will clog the fuel pump and/or carburetor.
One side of the bracket has both light blue and dark blue paint. Is it probable that as the engine went down the production line the bracket was installed and partially painted to match the dark blue engine block, which masking the lighter blue of the air cleaner?
It would be great if someone on the forum could check their bracket for a similar paint scheme.
Always contact a Nissan dealer first, many parts are still available for the 240Z. Be wary of used electrical parts, oftentimes the only way to properly test them is to install them on a running vehicle. Keith