Where is the fuel filter located on a 2006 lincoln navigator

SOURCE: Location of the fuel filter in a 1999 Lincoln Towncar

It is either along the frame rail, probably drivers side under car follow the metal fuel line or it is in the gas tank right at the fuel pump, either requires removing tank or carpet inside trunk to get to access panel, but your problem is probably not fuel filter, with todays clean fuels fuel filters are a problem of the past, used to be a easy fix but that is why they hide them now because they are usually good for life of vehicle, 1999 is not old enough to make difference in this situtation.

SOURCE: 2000 lincoln navigator 90k mile service

Normal Maintenance Details
90,000 Miles (144,000 Kilometers) : All Applicable Models
PERFORMED OPERATION COMPONENT
INSPECT BALL JOINTS
If equipped.
INSPECT BRAKE SYSTEM
Inspect brake pads, shoes, rotors, drums, brake lines & hoses.
INSPECT COOLING SYSTEM HOSES & CLAMPS
INSPECT DISC BRAKE PADS & ROTORS
INSPECT DRIVESHAFT
If equipped.
INSPECT DRIVESHAFT/PROPELLER SHAFT U JOINTS
INSPECT EXHAUST SYSTEM AND HEAT SHIELDS
INSPECT PARKING BRAKE SYSTEM
INSPECT STEERING LINKAGE
INSPECT SUSPENSION COMPONENTS
LUBRICATE DRIVESHAFT/PROPELLER SHAFT U JOINTS
LUBRICATE STEERING LINKAGE
REPLACE AIR CLEANER/ELEMENT
REPLACE AUTOMATIC TRANSMISSION FLUID
REPLACE CABIN AIR FILTER
If equipped.
REPLACE CLIMATE-CONTROLLED SEAT FILTERS
If equipped.
REPLACE ENGINE OIL
REPLACE ENGINE OIL FILTER
REPLACE FUEL FILTER
ROTATE TIRES
90,000 Miles (144,000 Kilometers) : RWD
PERFORMED OPERATION COMPONENT
LUBRICATE BALL JOINTS
2000 Lincoln Navigator
Maintenance
...sorry if not too readable

SOURCE: location of fuel filter 2006 suzuki aerio

In the fuel tank, accessed by removimg the fuel pump.

SOURCE: tp sensor replacement

it should be on your throttle body under the hood of your car

SOURCE: Fuel Filter Location

The fuel filter for a mark VIII (at least in my 1993), is behind the wheelwall on the front passenger side of the car. You will need to take the wheel off and also take off the black covering by pulling out the plastic mounts and metal screws. as soon as those are removed, you will not miss the filter mounted to the inside left of the wheelwell

Testimonial: "This was an excellant suggestion the filter was right where he said it would be. Thanks alot for your help"