Jetpack script adjustments

Question

Hello everyone, I have a jetpack script that I made and am having a few issues, for starters my gameplay is a 3rd person platformer that has an open world feature. In one of my worlds you are on the moon and can use the jetpack to jet around, only I don't want the player to be able to jet into the air forever so I would like to add a "gas" feature with a visible bar in the lower middle of the screen.

(When player holds F button jetpack is activated LIFT UP, when player is not grounded jet animations are activated, when player is grounded jet animations are de-activated)

This is where my issue is, does anyone have a good way of doing this with my script? Thanks!

Script:

 using UnityEngine;
 using System.Collections;
 
 public class JetPack : MonoBehaviour {
 
    public float JetPackForce;
    public float startTime = 3.5f;
    public GameObject player;
    public GameObject Rocket1;
    public GameObject Rocket2;
    Animator anim;
    
    void Start(){
        
         anim = GetComponent<Animator>();
        
       }
    void FixedUpdate () {
       if (Input.GetKey (KeyCode.F)) {
          Rocket1.SetActive(true);
          Rocket2.SetActive(true);
          startTime -= Time.deltaTime;
          player.rigidbody.AddForce(new Vector3(0.0f, 1.0f, 0.0f) * JetPackForce);
 
             }
             
       if (startTime <= 0.0f) {
          player.rigidbody.velocity = Vector3.down * Time.smoothDeltaTime;
          startTime = 3.5f;
             }
             
      if(anim.GetBool("Grounded")) {
           Rocket1.SetActive(false);
          Rocket2.SetActive(false);
 
      }
    }
 }

Answer 1

I ended up figuring it out, here's the adjusted code: (minus the visible bar which i will handle in NGUI)

 using UnityEngine;
 using System.Collections;
 
 public class JetPack : MonoBehaviour {
 
    public float JetPackForce;
    public float startTime = 3.5f;
    public float fuel = 10;
    public float maxFuel = 100;
    public bool isGrounded;
    public GameObject player;
    public GameObject Rocket1;
    public GameObject Rocket2;
    Animator anim;
    
    void Start(){
        
         anim = GetComponent<Animator>();
 
   }
    void FixedUpdate () {
       if (Input.GetKey (KeyCode.F) && fuel > 0) {
          Rocket1.SetActive(true);
          Rocket2.SetActive(true);
          startTime -= Time.deltaTime;
          player.rigidbody.AddForce(new Vector3(0.0f, 1.0f, 0.0f) * JetPackForce);
          fuel -= 10 * Time.deltaTime; 
 
             }
             
       if (startTime <= 0.0f) {
          player.rigidbody.velocity = Vector3.down * Time.smoothDeltaTime;
          startTime = 3.5f;
             }
             
      if(anim.GetBool("Grounded")) {
           Rocket1.SetActive(false);
          Rocket2.SetActive(false);
          isGrounded = true;
      }
 
          else{ 
          isGrounded = false;
     }
      
      if (fuel < maxFuel && isGrounded == true) //If the players fuel is less than the max fuel and the player is grounded
  {
      fuel += 10 * Time.deltaTime;
      print(fuel);
  //Increase the players fuel every second
  
      }
      
    }
 }

Jetpack script adjustments

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