diff --git a/mods/lord/Blocks/grinder/src/grinder/Grinder.lua b/mods/lord/Blocks/grinder/src/grinder/Grinder.lua
index d6f3cedc7..be39debd4 100644
--- a/mods/lord/Blocks/grinder/src/grinder/Grinder.lua
+++ b/mods/lord/Blocks/grinder/src/grinder/Grinder.lua
@@ -40,8 +40,8 @@ local function get_initiated_meta(pos)
 		"fuel_totaltime",
 		"fuel_time",
 		"src_totaltime",
-		"src_time" }) do
-		-- init with 0.0 if var not set
+		"src_time"
+	}) do
 		if not meta:get_float(name) then
 			meta:set_float(name, 0.0)
 		end
@@ -49,6 +49,18 @@ local function get_initiated_meta(pos)
 	return meta
 end
 
+--- @param meta NodeMetaRef
+local function reset_meta_vars(meta)
+	for _, name in pairs({
+		"fuel_totaltime",
+		"fuel_time",
+		"src_totaltime",
+		"src_time"
+	}) do
+		meta:set_float(name, 0.0)
+	end
+end
+
 --- Swaps node if node is not same and return old node name.
 --- @see minetest.swap_node (https://dev.minetest.net/minetest.swap_node)
 ---
@@ -90,6 +102,7 @@ end
 --- @public
 --- @param hint_en string A template for hinting in English. Use "%s" for machine name placeholder.
 function Grinder:deactivate(hint_en)
+	reset_meta_vars(self:get_meta())
 	swap_node(self.position, "grinder:grinder")
 	self:get_meta():set_string("infotext", SL((hint_en):format(machine_name)))
 	self:get_meta():set_string("formspec", form.get('inactive'))
diff --git a/mods/lord/Blocks/grinder/src/grinder/Processor.lua b/mods/lord/Blocks/grinder/src/grinder/Processor.lua
index abe38a58d..461f13442 100644
--- a/mods/lord/Blocks/grinder/src/grinder/Processor.lua
+++ b/mods/lord/Blocks/grinder/src/grinder/Processor.lua
@@ -5,9 +5,10 @@ local Grinder   = require("grinder.Grinder")
 --- - Returns whether grinding possible &
 --- - if possible, also returns (RecipeOutput - result, RecipeInput - remaining) for source & fuel.
 --- - So, returns `possible, result_source, remaining_source, result_fuel, remaining_fuel`
---- @param inv InvRef
+--- @param inv  InvRef
+--- @param meta NodeMetaRef
 --- @return boolean, RecipeOutput|nil, RecipeInput|nil, RecipeOutput|nil, RecipeInput|nil
-local function grinding_possible(inv)
+local function grinding_possible(inv, meta)
 	local result_source, remaining_source = minetest.get_craft_result({
 		method = 'grinder',
 		type   = 'cooking',
@@ -24,7 +25,10 @@ local function grinding_possible(inv)
 		items = inv:get_list("fuel")
 	})
 
-	local possible = result_source.time > 0 and result_fuel.time > 0 and inv:room_for_item("dst", result_source.item)
+	local possible =
+		result_source.time > 0 and
+		(result_fuel.time > 0 or meta:get_int("fuel_time") > 0) and
+		inv:room_for_item("dst", result_source.item)
 	if not possible then
 		return false, nil, nil, nil, nil
 	end
@@ -39,11 +43,10 @@ local function burn_fuel(meta, remaining_fuel, result_fuel)
 	local fuel_time = meta:get_int("fuel_time")
 	local fuel_totaltime = meta:get_int("fuel_totaltime")
 
-	if fuel_totaltime ~= result_fuel.time then
-		meta:set_int("fuel_totaltime", result_fuel.time)
-	end
 	if fuel_time == 0 then
 		meta:get_inventory():set_list("fuel", remaining_fuel.items)
+		meta:set_int("fuel_totaltime", result_fuel.time)
+		fuel_totaltime = result_fuel.time
 	end
 
 	fuel_time = fuel_time + 1
@@ -96,7 +99,7 @@ function Processor.act(pos)
 	local meta = g:get_meta()
 	local inv  = meta:get_inventory()
 
-	local possible, result_source, remaining_source, result_fuel, remaining_fuel = grinding_possible(inv)
+	local possible, result_source, remaining_source, result_fuel, remaining_fuel = grinding_possible(inv, meta)
 	if possible then
 		g:activate("%s Grinding")