Where is the fuel pump reset switch on a 1994 mercury marquis

l would look in the trunk, under the passenger side footwell or driver side footwell. owners manual may tell you

Open the trunk and look to the left. There should be a cut-out in the fabric on the sidewall with a red button. If it is not there, it is probably under the dash on the passenger side. It is in the trunk in my 94 mercury sable.

in the trunk, has a tag on it :)

In the trunk, left side, see your owners manual, though, before resetting, for cautions.
If you do not have a manual. go to
https://web.msslib.dealerconnection.com/RightSite/getcontent/myfile.pdf?DMW_OBJECTID=09000c588022027b
this is actually the manual for a '96 but it is the same as the '94
see page 45

(this is the entire owners manual, so the download might take a little time but l recommend that you save it (or print it ) for future ref.)

Lower left side in panel down by your ankle; its red.