It requires special tools available from the parts store cheap. They should show you how to use them.
find the fuel filter under the driver side near the frame disconnect both fuel lines remove filter from bracket place new fitler in place same way old one was in then reconnect fuel lines
To the best of my knowledge, there is no heater or outside air filter on the 1999 Ford Expedition, and Grease Monkey confirmed that when my Expedition (Eddie Bauer version) was in for service.
The Motorcraft ( FL-820-S ) engine oil filter for a 1999 Ford Expedition ( 4.6 L and 5.4 liter ) currently has a MSRP / LIST of $ 7.69 U.S.
According to the 1999 Ford Expedition Owner Guide : With engine oil filter change : ( 6.0 U.S. quarts )
Special tool required to disconnect lines available at Napa
The 1999 Ford Expedition owners manual shows 6 quarts / 5.7 liters of engine oil with filter change
It just unbolts. I think it like 3 or 4 bolts.
6 U.S. quarts with engine oil filter change
For a 1999 Ford Expedition , 4.6 liter V8 : With engine oil filter change : ( 6.0 U.S. quarts of 5W-30 ) according to the Owner Guide
Follow lines from master cylinder through ABS control to each individual wheel cylinder
According to the 1999 Ford Expedition Owner Guide : With engine oil filter change : The 4.6 and 5.4 V8 engines take ( 5.7 liters / 6.0 U.S. quarts of 5W-30 )
The fuel lines disconnect at the tank and yes there is a tool required. You can get it at advanced or discount auto for a couple of bucks.