With two wrenches, one on the big bolt and one on the line fitting, you ought to be able to squeeze the two together to loosen the fitting.

Replace the washer on the big bolt. You can use Permatex thread seal if necessary but it's usually not.

1950 Chevrolet 3100 (Ol' Roy)

1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)