In the fuel tank
41 liters
Try back near the fuel tank. if it is the same as my sunfire it is right behind the gas tank.
Sunfire fuel pumps are located inside the fuel tank. Replacing them requires the draining and removal of the fuel tank. If you're undertaking this job yourself, definitely pick up a Haynes or Chilton manual for your car. This will give you all of the steps with photos.
19 gallons
12.5 gallons
The heat shield on a 2005 Sunfire can be removed by taking out the retaining bolts. The gas tank can then be lowered from the vehicle.
The fuel pump is located inside the fuel tank. You'll have to drain the fuel and drop the tank to get at the pump.
Under the car by the fuel tank
yes
The fuel pump is located in the gas tank
Inside the fuel tank