2004 pt cruiser gas guage showing incorrect reading

THIS MEAN YOU NEED TO CHECK THE LEVEL SENSOR INSIDE THE GAS TANK MAYBE GIVES WRONG READING

2005 PT cruiser, i replaced the cam sensor with a aft market sensor my fuel gauge started reading wrong, and it didn't fix my problem so i replaced the cam sensor with a factory sensor it fix my running problem but the fuel gauge still reads wrong, with a full tank of gas the gauge reads 3/4 tank,

If it isnt in the cluster, its more than likely the fuel level sending unit. That is in the fuel tank.

sounds like fuel pump is good the floater may need replacing or the wire that reads the floater may be loose

It is most likely your fuel level sending unit has gone bad. It sits inside your fuel tank and uses a float similar to that uded in your toilet to tell the fuel guage how much gas you have in the tank.

In many cases, the unit can be accessed for replacment by removing the rear seat and opening the access port (3-4 screws) and removing the sending unit from the top of the fuel tank. It looks like this...

brand and octain dont matter if your cap isnt on tight it will come on or if you have replaced the cap some times it will come on it will just take a few times of driving it for it to shut off some where around 300 to500 miles

Your sending unit inside of the fuel tank is probably faulty. Unfortunately you have to drop the tank to change it.

U are going to have to replace the fuel guage sending unit in the fuel tank, there is no other part that will cause this problem

The most likely culprit is the sending unit in the tank. They are relatively easy to change, as long as you don't have much fuel in the tank. It's a mechanical unit that has a float that raises and lowers with the fuel level, however with age, the floats can develop leaks and no longer float, of the electronic portion of the unit can go bad and not register the proper level. They are replaced and an entire unit, so it doesn't matter which happened, you will need to change the fuel tank sending unit.

This condition is caused by a defective fuel guage sending unit, it is located in the fuel tank