On my 01 monte ss the gas gauge will be on E than move to half tank than back to E than to 1/4th than it just keeps moving around i never know when im going to run out of gas.. what do i do

 

In a car you are not sure about make sure you get gas at a 1/4 tank. lol. My Camaro would do this too/read 1/8 of a tank less then was in there. It is just something you have to get used to and gauge it cautiously. Also what helps is if when you fill up and take note of your amount of gas used and miles til empty. It has saved me a few times in all my cars.

 

Sounds like you may have the faulty guage problem that's common with 2000-2005 Montes. Or a bad sending unit in the tank.

 

Mine does something similar. When gas is low the gauge goes all over the place and commonly reads full.

 

Probably a bad stepper motor. There's a few places that you can send it to for repair, BBEngineer is one.

Might as well have all the motors changed while it's out. They're prone to fail anyways - so I'd tackle that before I start replacing the fuel level sender.

 

Have you considered...not running it down to empty?
Maybe try keeping at half?

It could also be a ground issue...

 

Fuel level sensor... Mine was doing the same until I replaced it

 

My old van did this and it was the sending unit in the tank. I was a 99 so i am sure its a similar GM part. I think the stepper motor issue the gauge jumps back and forth and the sending unit the gauge kinda floats back and forth. Maybe someone else can confirm this.

 

Mines never been a few harsh marks below half lol hope I never encounter this problem.

 

It is more than likely your fuel sending unit. I recommed you replace the sending unit and fuel pump at the sametime, as the fuel pump probably isn't THAT far behind failing.

Running the tank to E is not the cause of this problem, it's a part that's gone bad. Very common on late 90's early 00' GM vehicles.