lots of Civic sub models
the fsm covers this. "factory service manual" buy one, and read it.
so does alldata.com
ever use google
here is 1st hit, your ,Q
http://answers.yahoo.com/question/index?qid=20080106202852AAqXLnp
where, we look in front of the gas tank
see if it is there, first, always.
not guess. some models or midyear changes, move it inside the tank but most cars 98 its right there near tank. on the main fuel line.
on all cars, EFI you can follow the fuel line from the fuel rail (or reg)
to the tank and the filter is then discovered, ever time. if not , its in the tank that is why we never look it up, we just look for it.
this can also vary by engine, options (sized) so..... look first/
or alldata.com
go there look up your, year, model, sub model and engine, type.