Look either in the kick panels or the driver's side trunk panel
On a 1999 Mercury Cougar : The fuel pump shut off switch ( inertia switch ) is in the drivers footwell behind the kick panel ( there is an access hole )
According to my Chilton's Auto Repair Manual : A ( 1991 ) Mercury Cougar has a ( 19.0 US. gallon gas tank )
The fuel pump inertia switch is in the drivers footwell behind the kick panel ( there is an access hole ) in the 1999 Mercury Cougar
According to the 2002 Mercury Cougar Owner Guide : The fuel pump shut - off switch ( inertia switch ) is located in the drivers foot well , behind the kick panel ( there is an access hole )
Your 1991 Mercury fuel pump relay switch is located on the firewall of the engine compartment. The relay switch will be near the center of the firewall.
near the fusebox (drivers side interior)
On a 1999 Mercury Cougar : The fuel pump relay is in the Power Distribution Box ( which is " live " ) located in the engine compartment ( it is relay R1 and is one of the black relays )
There is an inertia switch / fuel cutoff switch in behind the trunk liner , on the left side of the trunk ( there is an access hole )
The 1994 Mercury Cougar 4.6 liter engine fuel pump relay switch can be found on the firewall in the engine compartment. The fuel pump relay switch will be on the passenger side of the firewall.
On a 2001 Mercury Cougar : The fuel pump shut off switch ( inertia switch ) is located in the drivers foot well behind the kick panel ( there is an access hole ) * the kick panel is the interior trim panel , in front of the front door , beside the persons feet
On a 1999 Mercury Cougar : The ELECTRIC fuel pump is INSIDE the fuel tank It is installed through an access hole in the top of the fuel tank
im pretty sure its in your trunk on the left side. Mine is a 96 and that's where it is...