A Haynes or Chilton manual for your car will walk you through it.
It IS, however what I'd consider a big job. You may or may not want to take it on. You'll probably have to take the head to a machine shop to make sure that it's not warped. If it is, it may have to be milled or replaced.
where is the fuel filter located on a 2003 Pontiac sunfire
2003 sunfire
No, it has a cam chain.
The Fuel pump is in the gas tank.. You will need to drop the tank to fine the fuel pump..
4
30 to 35 psi
The 2003 Pontiac Sunfire came from the manufacturer equipped with 225 65R 15 tires. The back and the front tires were the same size.
Take it out and put a new one in!
you should be able to buy the pigtail either at a parts store or the dealer. Otherwise you can get one from a junkyard fairly cheap and replace the bad one.
buy a new one
Pick up a Haynes or Chilton manual for your model. Follow their directions. It's really too involved to explain every step here.
There's a black cord inside the trunk on the top left.