Vehicle body floor construction of motor vehicle

A vehicle body floor construction of a motor vehicle, comprising:

• (a) an upwardly projecting and downwardly opening tunnel disposed in a longitudinal direction of a vehicle and formed at the central portion of a transverse direction of a floor panel of said vehicle, said tunnel having a first end and a second end;
• (b) a fuel tank disposed in said tunnel;
• (c) a first pair of cross members integrally formed in the transverse direction on said floor panel, said cross members traversing said tunnel at a forward end and at a rear end of said fuel tank and substantially at the bottom level of said fuel tank disposed in said tunnel to block said tunnel and protect said fuel tank;
• (d) a second pair of cross members comprising a left cross member and a right cross member connected to said floor panel in the transverse direction, a first end of said left cross member and a first end of said right cross member being connected to opposite outer side surfaces of said tunnel at a point which is substantially equidistant in the longitudinal direction from said first end and said second end of said tunnel;
• (e) a bulkhead traversing the opening of said tunnel below said fuel tank disposed therein, said bulkhead being connected to said floor panel at a point which is substantially equidistant in the longitudinal direction from said first end and said second end of said tunnel formed therein;
• and
• (f) at least two longitudinally extending closed cross-sectional reinforcing portions integrally formed on said floor panel at transversely opposite sides of the opening of said tunnel, said closed cross-sectional reinforcing portions extending for at least the length of said fuel tank.