If you are thinking of a fuel shut off switch like what the Town Cars and Crown Vics have, the LS doesn't have one.
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On a 2000 Lincoln LS :
The fuel pump shut off switch ( inertia switch ) is in the DRIVERS footwell
behind the kick panel . There is an access hole through the panel
* the kick panel is the interior trim panel , in front of the front door , beside the drivers left foot
On a 2000 Lincoln LS : The fuel pump shut off switch ( inertia switch ) is located in the drivers foot well , behind the kick panel ( there is an access hole )
On a 2000 Lincoln Continental : The fuel pump shut off switch ( inertia switch ) is To the left of the drivers seat , behind an access panel on the B pillar ( latch pillar )
On a 2000 Lincoln Continental : The fuel pump shut off switch ( inertia switch ) is behind an access panel , on the " B " pillar , to the left of the drivers seat
On a 2000 Lincoln Continental : The fuel pump inertia switch ( shut off switch ) is located behind a panel , to the left of the drivers seat , on the " B " pillar / latch pillar
left rear of trunk panel
On a 2001 Lincoln Navigator : The fuel pump shut off switch ( inertia switch ) is in the front passenger footwell , by the kick panel
On a 2004 Lincoln LS : The fuel pump inertia switch ( shut off switch ) is located in the drivers footwell behind the kick panel ( there is an access hole )
There is not one.
On a 1999 Lincoln Continental : The fuel pump shut off switch ( inertia switch ) is located to the left of the drivers seat , behind an access panel on the " B " pillar
On a 2006 Lincoln Navigator : The fuel pump shut off switch ( inertia switch ) is located in the cargo area , near the liftgate , it is behind an access panel on the drivers side
Jeep doesn't use a shut of switch. The fuel system is computer controlled through relays.
Trunk.