On the 1999 Daewooo Laganza the fuel filter is on the fire wall and is held on with clips or a clamp. Just follow the fuel line from the injector block and you will see it. The replacement should be available at any parts store, if not ask the clerk for help. NAPA has most after market parts??
on a 2001 simply turn with hand counter clockwise.
Remove the back seat and it should be acessible from within the car.
Remove dash,centre console,heater box and you'll find it in there
Bottom left side of engine looking at from front. Remove passenger front tire. Is located under cowling but can be removed without taking cowling off.
You can't see it until you remove the dash and centre console,then remove heater box and you'll find it in there
Run the car without the fuel pump fuse until it stops.
jack up the car front end removed the tires remove the lower control arm
you take out the two strews on the side, then the strew in the area of the window button pry off the panel
Remove the radio(carefully). The code is on the back Wow, real theft detterent
Remove the the plastic cover on the valve cover, next remove the coil,or spark plug boot. Then you have access to the spark plugs. Make sure you gap your spark plugs,before you install them. If your not sure, it's wise to do them one at a time. After the replacement, do everything in reverse order.
On a 1999 Leganza it's under the passenger door sill. Remove the plastic sill and it's under the carpet.
Remove the water from the cooling system. Remove the water hose from the heater core. Remove the heater core retaining bolts. Reverse the process to install the new heater core.