he died in Marseilles bouche de Rhone on 9.2.1970
i have his name and all info.
how can i locate his grave where he is buried
I checked with FindAGrave.com and the closest (and largest-it is huge) cemetery to Francesco MACCHI's residence on rue Seraphin, is Cimetière Saint-Pierre. (https://www.findagrave.com/cemetery/2441251/cimeti%C3%A8re-saint-pierre) However only a small portion of that cemetery has been photographed or memorials entered and his name does not return in a search. You could try writing or calling, if you speak French, to the cemetery and asking for any information on his burial.
The address of the cemetery is:
380 Rue Saint-Pierre
Marseille, Departement des Bouches-du-Rhône, Provence-Alpes-Côte d'Azur, 13005 France
Phone: +33 4 91 14 67 00
Apparently there is also an interactive terminal at the entrance of the cemetery that will assist in locating any tomb in the cemetery.
He does not show up in a search of Geneanet collection of tombstone photographs either. https://www.geneanet.org/cimetieres/collection/1125-cimetiere-saint-pierre