diff --git a/programs/goo.lua b/programs/goo.lua
index 70ee5ba..4639233 100644
--- a/programs/goo.lua
+++ b/programs/goo.lua
@@ -1,11 +1,21 @@
-local _VERSION = '0.1.0';
+local _VERSION = '0.1.1';
 
 local args = table.pack(...);
 local command = args[1];
 
 local GOO_BLOCK_PREFIX = 'justdirethings:gooblock_tier';
+local MIN_START_FUEL = 50;
+local REFUEL_THRESHOLD = 1000;
 local WAIT_SECONDS = 2;
 
+local FUEL_ITEMS = {
+  'justdirethings:coal_t4',
+  'justdirethings:coal_t3',
+  'justdirethings:coal_t2',
+  'justdirethings:coal_t1',
+  'minecraft:coal',
+};
+
 local PROCESS_ITEMS = {
   ['minecraft:iron_block'] = { tier = 1, label = 'iron' },
   ['minecraft:coal_block'] = { tier = 1, label = 'coal' },
@@ -107,6 +117,119 @@ local function findItemSlot(itemName)
   return nil;
 end
 
+local function waitForInventory(message)
+  if message then
+    print(message);
+  end
+
+  os.pullEvent('turtle_inventory');
+end
+
+local function getFuelLevel()
+  local fuelLevel = turtle.getFuelLevel();
+
+  if fuelLevel == 'unlimited' then
+    return nil;
+  end
+
+  return fuelLevel;
+end
+
+local function getRefuelTarget()
+  local fuelLimit = turtle.getFuelLimit();
+
+  if fuelLimit == 'unlimited' or fuelLimit >= REFUEL_THRESHOLD then
+    return REFUEL_THRESHOLD;
+  end
+
+  return fuelLimit;
+end
+
+local function findFuelSlot()
+  for i = 1, #FUEL_ITEMS do
+    local slot, item = findItemSlot(FUEL_ITEMS[i]);
+
+    if slot then
+      return slot, item;
+    end
+  end
+
+  return nil;
+end
+
+local function refuelFromInventory()
+  local fuelLevel = getFuelLevel();
+
+  if not fuelLevel or fuelLevel >= getRefuelTarget() then
+    return false;
+  end
+
+  local previousSlot = turtle.getSelectedSlot();
+  local consumedFuel = false;
+
+  while fuelLevel < getRefuelTarget() do
+    local slot, item = findFuelSlot();
+
+    if not slot then
+      break;
+    end
+
+    turtle.select(slot);
+
+    if turtle.refuel(1) then
+      consumedFuel = true;
+      print('Refueled with ' .. item.name .. '. Fuel: ' .. tostring(turtle.getFuelLevel()));
+      fuelLevel = getFuelLevel();
+    else
+      print('Could not refuel with ' .. item.name .. '.');
+      break;
+    end
+  end
+
+  turtle.select(previousSlot);
+
+  return consumedFuel;
+end
+
+local function ensureStartFuel()
+  while true do
+    local fuelLevel = getFuelLevel();
+
+    if not fuelLevel or fuelLevel >= MIN_START_FUEL then
+      return;
+    end
+
+    refuelFromInventory();
+    fuelLevel = getFuelLevel();
+
+    if not fuelLevel or fuelLevel >= MIN_START_FUEL then
+      return;
+    end
+
+    waitForInventory('Fuel is below ' .. tostring(MIN_START_FUEL) .. '. Insert fuel to start.');
+  end
+end
+
+local function ensureRuntimeFuel()
+  local fuelLevel = getFuelLevel();
+
+  if not fuelLevel then
+    return;
+  end
+
+  if fuelLevel < getRefuelTarget() then
+    refuelFromInventory();
+  end
+
+  fuelLevel = getFuelLevel();
+
+  while fuelLevel and fuelLevel < MIN_START_FUEL do
+    waitForInventory('Fuel is below ' .. tostring(MIN_START_FUEL) .. '. Insert fuel to continue.');
+    refuelFromInventory();
+    fuelLevel = getFuelLevel();
+  end
+end
+
 local function findFeedingSlot(gooTier)
   local feedingItems = FEEDING_ITEMS_BY_TIER[gooTier] or {};
 
@@ -155,8 +278,7 @@ local function ensureGooAlive()
     local slot, item = findFeedingSlot(gooTier);
 
     if not slot then
-      print('Goo tier ' .. tostring(gooTier) .. ' is not alive. Waiting for feeding item...');
-      os.sleep(WAIT_SECONDS);
+      waitForInventory('Goo tier ' .. tostring(gooTier) .. ' is not alive. Waiting for feeding item...');
     else
       turtle.select(slot);
       print('Goo tier ' .. tostring(gooTier) .. ' is not alive. Feeding with ' .. item.name .. '...');
@@ -377,7 +499,11 @@ end
 
 print('goo started. Place the turtle directly below the goo block.');
 
+ensureStartFuel();
+
 while true do
+  ensureRuntimeFuel();
+
   local gooTier = ensureGooAlive();
   local hasEligibleBlocks = findEligibleProcessSlot(gooTier) ~= nil;
 
@@ -390,10 +516,9 @@ while true do
   if not changed then
     if hasEligibleBlocks then
       print('No free goo side found. Waiting for processing...');
+      os.sleep(WAIT_SECONDS);
     else
-      print('No eligible process block found. Waiting for inventory...');
+      waitForInventory('No eligible process block found. Waiting for inventory...');
     end
-
-    os.sleep(WAIT_SECONDS);
   end
 end