1997 Toyota Corolla Fuel Filter Location

Follow the flexible (rubber) line from the fuel rail down to the filter, but generally they are on the firewall, below the cannister.
When replacing, it is better to remove the left side stone shield and tire and access it from the hole that the steering rod comes through.
One connection is banjo bolt and the other is double inverted flare, so use a tubing wrench.
Replace the copper washers on the banjo side, they should be included with new filter.