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void Fuel(int amount)
{
  pinMode(2, INPUT);
  pinMode(3, INPUT);
  pinMode(4, INPUT);
  pinMode(5, INPUT);
  pinMode(6, INPUT);
  pinMode(7, INPUT);
 
  if (amount >= 90)
  {
    pinMode(2, OUTPUT);
    digitalWrite(2, LOW);
    return;
  }
  if (amount >= 75)
  {
    pinMode(3, OUTPUT);
    digitalWrite(3, LOW);
    return;
  }
  if (amount >= 50)
  {
    pinMode(4, OUTPUT);
    digitalWrite(4, LOW);
    return;
  }
  if (amount >= 25)
  {
    pinMode(5, OUTPUT);
    digitalWrite(5, LOW);
    return;
  }
  if (amount >= 10)
  {
    pinMode(6, OUTPUT);
    digitalWrite(6, LOW);
    return;
  }
  if (amount >= 0)
  {
    pinMode(7, OUTPUT);
    digitalWrite(7, LOW);
    return;
  }
}