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Inertia Fuel Shutoff Switch

WARNING: DO NOT reset IFS switch until fuel system has been inspected for leaks and repaired if necessary.
  1. If IFS switch is tripped, engine cannot be restarted until switch is manually reset. To reset IFS switch, depress switch button. For IFS switch location, see INERTIA FUEL SHUTOFF SWITCH LOCATION  table.
  2. To test IFS switch, turn ignition off. Remove IFS switch. Shake IFS switch to force it into tripped position (switch open). Check continuity between appropriate IFS switch terminals. See WIRING DIAGRAMS article. Continuity should not exist. Reset switch and ensure continuity exists between appropriate terminals.
INERTIA FUEL SHUTOFF SWITCH LOCATION

Application Location
Continental, Sable & Taurus On Left "B" Pillar
Cougar, Escort, Escort ZX2 & LS Bottom Of Left "A" Pillar
Crown Victoria, Grand Marquis & Town Car In Trunk Behind Left Luggage Compartment Lining
Focus Bottom Of Right "A" Pillar
Mustang Lower Left Rear Of Trunk