Depends on the make, model, and year.
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The fuel pump in your Sunfire is located inside the fuel tank. Replacing it means
removing the tank from the car. This is a job with many safety issues. If you plan to do the job yourself, I recommend picking up a Haynes or Chilton manual for your car. It will have all the procedures, complete with photos, to walk you through the job. In this case, your expense will be only the pump and perhaps a few hand tools you might not have. If you have your mechanic do the job, there will be several hours of labor involved.
where is the fuel filter located on a 2003 Pontiac sunfire
It is in the fuel tank, and expensive ($300 USD)
The fuel filter on a 2002 Pontiac Sunfire is in the rear between the fuel tank and the rear axle. By the way its under the car and easy to change takes about 10 minutes.
In the fuel tank
Where is the fuel idle control valve for a 2002 Pontiac Sunfire
If the part number is the same and the configuration is the same then sure.
Look under the vehicle - follow the fuel line from the tankRemove clamps and support to replace
On average a 1995 Pontiac Sunfire will get about 36 miles per gallon of fuel.
no
nope.
yes
The fuel pump is located in the gas tank