New answer: Add to your .vimrc let fortran_have_tabs=1, which should get rid of it. The only side effect is that the tabs no longer stand out.
:
, fortran.vim 332:
syn match fortranSerialNumber excludenl "^.\{73,}$"lc=72
myfortran.vim( ~/.vim/), set syntax = myfortran. , , .
fortran.vim, ~/.vim/, /usr/yourvimdir/