This is correct go to rockauto.Com and look up your truck and the pump because of 2 reason the float will not read correctly and the base might have a different bolt pattern for the mounting plate but you could just swap the pumps without the sender and it will run and I mean the actual pump swap to the other sender and mounting plate
It may possibly fit between the 2 BUT the distance of travel and position of the float would be different places between the 2 tanks, being of different volume that is. Your best off getting the proper unit for your needs, they're not that expensive from and auto parts counter.
SOURCE: HOW TO REMOVE A HEATER CORE IN A 2003 LINCOLN NAVIGATOR
U must remove the entire dash assembly and then the heater core housing which is part of the air distribution box, time to do the job 10-15 hours.
SOURCE: Air suspension pump on 2003 lincoln navigator
the little orange or red ring around the air hose whare it goes in compressor, must be pushed in while pulling out on air line. a small flathead screwdriver works fine
SOURCE: need to find fuel pump relay on 2003 lincoln
in the passenger compartment fuse box the relay is
R303 Fuel pump relay
SOURCE: how do you replace fuel pump in lincoln navigator
Fuel Pump Module
Removal & Installation
To Remove:
WARNING
Highly flammable mixtures are always present in any fuel related component. Smoking or carrying lighted tobacco or an open flame of any type may ignite the flammable mixtures.
WARNING
Even when the engine is not running, fuel in the fuel system remains under high pressure. Fuel system pressure must be relieved before working on or disconnecting any of the fuel lines, fuel tubes, or fuel system components. Failure to do so may result in accidental spraying of fuel, personal injury, or a fire hazard.
To Install: 
SOURCE: 2003 navigator fule pump relay
Located under the dash on drivers side.
Testimonial: "that doesnt help me at all. need a exact location of relay"
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