Python3 If statement not changing variable

I am not quite sure how to describe this problem so i will just say what it's supposed to do and what it is actually doing.

what's supposed to happen in the below code is when i run car_name.drive()

if random.choice(EVENTS) == "gas_station":
    AT_GAS_STATION = True
    print("You are at a gas station")

and if AT_GAS_STATION is true is prints'you are at a gas station' which it does, but if i then run car_name.refuel it should execute this part:

elif self.fuel_level < self.fuel_capacity and AT_GAS_STATION == True:
        self.fuel_level = self.fuel_capacity
        print("Your fuel tank is full")

But it does not it instead executes this:

elif self.fuel_level < self.fuel_capacity and AT_GAS_STATION == False:
        print("You are not at a gas station and therfore can't fill up")

what i mean is that an idle session would look like this:

>>> from car import Car
>>> pilot = Car("honda", "pilot", 2003, 19, "blue")
>>> pilot.drive()
You are at a gas station
The car is moving
>>> pilot.refuel()
You are not at a gas station and therfore can't fill up

So i believe that the problem is it is not changing AT_GAS_STATION to False

I have tried running getattr(pilot, "self.fuel_level") to see if i had filled up but just printed the wrong message but i got this:

Traceback (most recent call last):
  File "<pyshell#80>", line 1, in <module>
    getattr(pilot, "self.fuel_level")
AttributeError: 'Car' object has no attribute 'self.fuel_level'

The full code:

import random

EVENTS = [
    "gas_station",
    "nothing",
    "nothing",
    "nothing",
    "nothing",
    "nothing"]
random.shuffle(EVENTS)
AT_GAS_STATION = False

class Car():
    """Your car."""

    def __init__(self, make, model, year, fuel_capacity, color=None):
        """Atributtes of your car, fuel in gallons."""
        self.color = color
        self.make = make
        self.model = model
        self.year = year
        self.fuel_capacity = fuel_capacity
        self.fuel_level = self.fuel_capacity
        if self.year < 2000:
            print("Your car is old")

def refuel(self):
    """Fill up your gas."""

    if self.fuel_level >= self.fuel_capacity:
        print("Your tank is already full :P")
    elif self.fuel_level < self.fuel_capacity and AT_GAS_STATION == False:
        print("You are not at a gas station and therfore can't fill up")
    elif self.fuel_level < self.fuel_capacity and AT_GAS_STATION == True:
        self.fuel_level = self.fuel_capacity
        print("Your fuel tank is full")

def drive(self):
    """Drive your car"""
    self.fuel_level = self.fuel_level -1

    if random.choice(EVENTS) == "gas_station":
        AT_GAS_STATION = True
        print("You are at a gas station")
    elif random.choice(EVENTS) != "gas_station":
        AT_GAS_STATION = False

    if self.fuel_level < 1:
        print("You need more gas")
    elif self.fuel_level <= self.fuel_capacity /2:
        print(self.fuel_level -1)
    else:
        print("The car is moving")

def specs(self):
    """Display specs of your car"""
    print(self.color, self.year, self.make, self.model, self.fuel_capacity, "Gallons")

Hopefully i have provided enough information but if you want more just ask.