diff --git a/src/main/kotlin/ru/otus/cars/Car.kt b/src/main/kotlin/ru/otus/cars/Car.kt
index 559978c..3da1b07 100644
--- a/src/main/kotlin/ru/otus/cars/Car.kt
+++ b/src/main/kotlin/ru/otus/cars/Car.kt
@@ -19,6 +19,11 @@ interface Car : CarInput {
      */
     val carOutput: CarOutput
 
+    /**
+     * Топливная горловина
+     */
+    val tankMouth: TankMouth
+
     /**
      * Получить оборудование
      */
diff --git a/src/main/kotlin/ru/otus/cars/CarFactory.kt b/src/main/kotlin/ru/otus/cars/CarFactory.kt
index 3b8f03e..84233ae 100644
--- a/src/main/kotlin/ru/otus/cars/CarFactory.kt
+++ b/src/main/kotlin/ru/otus/cars/CarFactory.kt
@@ -18,7 +18,7 @@ object Togliatti : CarFactory {
         println("Запил ${Vaz2107.MODEL} в Тольятти...")
         val vaz = Vaz2107.build(plates)
         println("Проверяем тачку...")
-        Vaz2107.test(vaz)
+        Vaz2107.test(vaz as Vaz2107)
         vaz.drdrdrdrdr()
         return vaz
     }
@@ -27,7 +27,7 @@ object Togliatti : CarFactory {
         println("Запил ${Vaz2108.MODEL} в Тольятти...")
         val vaz = Vaz2108.build(plates)
         println("Сход-развал...")
-        Vaz2108.alignWheels(vaz)
+        Vaz2108.alignWheels(vaz as Vaz2108)
         vaz.zhzhzhzh()
         return vaz
     }
diff --git a/src/main/kotlin/ru/otus/cars/CarOutput.kt b/src/main/kotlin/ru/otus/cars/CarOutput.kt
index 875339f..000e217 100644
--- a/src/main/kotlin/ru/otus/cars/CarOutput.kt
+++ b/src/main/kotlin/ru/otus/cars/CarOutput.kt
@@ -8,4 +8,5 @@ interface CarOutput {
      * Скажи текущую скорость
      */
     fun getCurrentSpeed(): Int
+    fun getTankContents(): Int
 }
\ No newline at end of file
diff --git a/src/main/kotlin/ru/otus/cars/FuelStation.kt b/src/main/kotlin/ru/otus/cars/FuelStation.kt
new file mode 100644
index 0000000..ba16507
--- /dev/null
+++ b/src/main/kotlin/ru/otus/cars/FuelStation.kt
@@ -0,0 +1,30 @@
+package ru.otus.cars
+
+interface FuelStationInterface {
+    fun refuel(tankMouth: TankMouth, volume: Int): RefuelResult
+}
+
+enum class RefuelResult {
+    DONE,
+    ERROR
+}
+
+class FuelStation : FuelStationInterface {
+    override fun refuel(tankMouth: TankMouth, volume: Int): RefuelResult {
+        try {
+            tankMouth.open()
+            when (tankMouth) {
+                is TankMouth.LpgTankMouth -> tankMouth.fuelLpg(volume)
+                is TankMouth.PetrolTankMouth -> tankMouth.fuelPetrol(volume)
+            }
+            tankMouth.close()
+            return RefuelResult.DONE
+        } catch (e: TankMouthException) {
+            println(e.message)
+            return RefuelResult.ERROR
+        } catch (e: Throwable) {
+            println("Что-то не так. Прекратили все работы.")
+            return RefuelResult.ERROR
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/main/kotlin/ru/otus/cars/Tank.kt b/src/main/kotlin/ru/otus/cars/Tank.kt
new file mode 100644
index 0000000..debdbdb
--- /dev/null
+++ b/src/main/kotlin/ru/otus/cars/Tank.kt
@@ -0,0 +1,44 @@
+package ru.otus.cars
+
+open class Tank(val initialVolume: Int) : TankInterface {
+
+    private var volume: Int = initialVolume
+        get() {
+            if (field <= 0) throw Exception("Tank volume should be more than zero")
+            return field
+        }
+        set(value) {
+            if (value <= 0) throw Exception("Tank volume should be more than zero")
+            field = value
+        }
+
+    private var fuelBalance: Int = 0
+
+    override fun getContents(): Int = fuelBalance
+
+    override fun receiveFuel(liters: Int) {
+        when {
+            liters < 0 -> throw TankException("Liters can't be negative")
+            liters + fuelBalance > volume -> {
+                fuelBalance = volume
+                throw TankException("Tank full")
+            }
+
+            liters + fuelBalance <= volume -> fuelBalance += liters
+        }
+    }
+
+    override fun toString(): String {
+        return "Tank(volume=$volume, fuelBalance=$fuelBalance)"
+    }
+
+
+}
+
+
+interface TankInterface {
+    fun getContents(): Int
+    fun receiveFuel(liters: Int)
+}
+
+class TankException(message: String) : Exception(message)
\ No newline at end of file
diff --git a/src/main/kotlin/ru/otus/cars/TankMouth.kt b/src/main/kotlin/ru/otus/cars/TankMouth.kt
new file mode 100644
index 0000000..e346e9c
--- /dev/null
+++ b/src/main/kotlin/ru/otus/cars/TankMouth.kt
@@ -0,0 +1,68 @@
+package ru.otus.cars
+
+
+interface TankMouthInterface {
+    fun open()
+    fun close()
+}
+
+sealed class TankMouth : TankMouthInterface {
+    protected lateinit var tank: TankInterface
+
+    protected fun buildWithTank(tank: TankInterface): TankMouth {
+        this.tank = tank
+        return this
+    }
+
+    protected fun receiveFuel(liters: Int) {
+        try {
+            tank.receiveFuel(liters)
+        } catch (e: TankException) {
+            throw TankMouthException(e.message ?: "Tank mouth error")
+        }
+    }
+
+    fun getContents() : Int = tank.getContents()
+
+    enum class TankMouthState { OPEN, CLOSED }
+
+    private var state: TankMouthState = TankMouthState.CLOSED
+    override fun open() {
+        state = TankMouthState.OPEN
+    }
+
+    override fun close() {
+        state = TankMouthState.CLOSED
+    }
+
+    class PetrolTankMouth private constructor(): TankMouth() {
+        companion object  {
+            fun build(tank: TankInterface) : TankMouth {
+                return PetrolTankMouth().buildWithTank(tank)
+            }
+        }
+
+        fun fuelPetrol(liters: Int) = super.receiveFuel(liters)
+
+        override fun toString(): String {
+            return "PetrolTankMouth($tank)"
+        }
+    }
+
+    class LpgTankMouth private constructor(): TankMouth() {
+        companion object  {
+            fun build(tank: TankInterface) : TankMouth {
+                return LpgTankMouth().buildWithTank(tank)
+            }
+        }
+        fun fuelLpg(liters: Int) = super.receiveFuel(liters)
+
+        override fun toString(): String {
+            return "LpgTankMouth($tank)"
+        }
+    }
+}
+
+
+
+class TankMouthException(message: String) : Exception(message)
\ No newline at end of file
diff --git a/src/main/kotlin/ru/otus/cars/Taz.kt b/src/main/kotlin/ru/otus/cars/Taz.kt
index 49df937..f04f0e6 100644
--- a/src/main/kotlin/ru/otus/cars/Taz.kt
+++ b/src/main/kotlin/ru/otus/cars/Taz.kt
@@ -18,10 +18,19 @@ object Taz: Car {
     override val carOutput: CarOutput
         get() = throw NotImplementedError("Приборов нет")
 
+
+    class TazTank: Tank(initialVolume = 20) {
+        override fun receiveFuel(liters: Int) {
+            throw NotImplementedError("Bang!!")
+        }
+    }
+
     /**
      * Получить оборудование
      */
     override fun getEquipment(): String = "Крыса"
+    override val tankMouth: TankMouth
+        get() = TankMouth.PetrolTankMouth.build(TazTank())
 
     /**
      * Руль вправо на [degrees] градусов
diff --git a/src/main/kotlin/ru/otus/cars/Vaz2107.kt b/src/main/kotlin/ru/otus/cars/Vaz2107.kt
index be857d2..38358ff 100644
--- a/src/main/kotlin/ru/otus/cars/Vaz2107.kt
+++ b/src/main/kotlin/ru/otus/cars/Vaz2107.kt
@@ -17,9 +17,10 @@ class Vaz2107 private constructor(color: String) : VazPlatform(color) {
             }
         }
 
-        override fun build(plates: Car.Plates): Vaz2107 = Vaz2107("Зеленый").apply {
+        override fun build(plates: Car.Plates): Car = Vaz2107("Зеленый").apply {
             this.engine = getRandomEngine()
             this.plates = plates
+            this.tankMouth = TankMouth.LpgTankMouth.build(Tank(50))
         }
 
         /**
@@ -40,6 +41,9 @@ class Vaz2107 private constructor(color: String) : VazPlatform(color) {
     override lateinit var engine: VazEngine
         private set
 
+    override lateinit var tankMouth: TankMouth
+        private set
+
     /**
      * Семерка едет так
      */
@@ -59,7 +63,7 @@ class Vaz2107 private constructor(color: String) : VazPlatform(color) {
 
     // Выводим состояние машины
     override fun toString(): String {
-        return "Vaz2107(plates=$plates, wheelAngle=$wheelAngle, currentSpeed=$currentSpeed)"
+        return "Vaz2107(plates=$plates, wheelAngle=$wheelAngle, currentSpeed=$currentSpeed, tankMouth=$tankMouth)"
     }
 
     /**
@@ -74,5 +78,9 @@ class Vaz2107 private constructor(color: String) : VazPlatform(color) {
         override fun getCurrentSpeed(): Int {
             return this@Vaz2107.currentSpeed
         }
+
+        override fun getTankContents(): Int {
+            return this@Vaz2107.tankMouth.getContents()
+        }
     }
 }
\ No newline at end of file
diff --git a/src/main/kotlin/ru/otus/cars/Vaz2108.kt b/src/main/kotlin/ru/otus/cars/Vaz2108.kt
index 27b83b8..2fb91ba 100644
--- a/src/main/kotlin/ru/otus/cars/Vaz2108.kt
+++ b/src/main/kotlin/ru/otus/cars/Vaz2108.kt
@@ -18,9 +18,10 @@ class Vaz2108 private constructor(color: String) : VazPlatform(color) {
             }
         }
 
-        override fun build(plates: Car.Plates): Vaz2108 = Vaz2108("Красный").apply {
+        override fun build(plates: Car.Plates): Car = Vaz2108("Красный").apply {
             this.engine = getRandomEngine()
             this.plates = plates
+            this.tankMouth = TankMouth.PetrolTankMouth.build(Tank(65))
         }
 
         fun alignWheels(vaz2108: Vaz2108) {
@@ -38,6 +39,9 @@ class Vaz2108 private constructor(color: String) : VazPlatform(color) {
     override lateinit var engine: VazEngine
         private set
 
+    override lateinit var tankMouth: TankMouth
+        private set
+
     /**
      * Восьмерка едет так
      */
@@ -63,7 +67,7 @@ class Vaz2108 private constructor(color: String) : VazPlatform(color) {
 
     // Выводим состояние машины
     override fun toString(): String {
-        return "Vaz2108(plates=$plates, wheelAngle=$wheelAngle, currentSpeed=$currentSpeed)"
+        return "Vaz2108(plates=$plates, wheelAngle=$wheelAngle, currentSpeed=$currentSpeed, tankMouth=$tankMouth)"
     }
 
     /**
@@ -78,5 +82,9 @@ class Vaz2108 private constructor(color: String) : VazPlatform(color) {
         override fun getCurrentSpeed(): Int {
             return this@Vaz2108.currentSpeed
         }
+
+        override fun getTankContents(): Int {
+            return this@Vaz2108.tankMouth.getContents()
+        }
     }
 }
\ No newline at end of file
diff --git a/src/main/kotlin/ru/otus/cars/main.kt b/src/main/kotlin/ru/otus/cars/main.kt
index 978d0ef..0d477bc 100644
--- a/src/main/kotlin/ru/otus/cars/main.kt
+++ b/src/main/kotlin/ru/otus/cars/main.kt
@@ -16,6 +16,7 @@ fun main() {
     techChecks()
     println("\n===> Taz...")
     println(Taz.color)
+    refuelCars()
 }
 
 fun driveCars() {
@@ -31,7 +32,7 @@ fun driveCars() {
 
 fun innerNestedCheck() {
     val vaz = Vaz2107.build(Car.Plates("123", 77))
-    val output = vaz.VazOutput() // Создаем новый объект ИЗ ЭКЗЕМПЛЯРА МАШИНЫ
+    val output = (vaz as Vaz2107).VazOutput() // Создаем новый объект ИЗ ЭКЗЕМПЛЯРА МАШИНЫ
 
     println("Скорость до проверки: ${output.getCurrentSpeed()}") // Выводит 0
     Vaz2107.test(vaz) // Газуем...
@@ -78,8 +79,8 @@ fun techChecks() {
     val vaz1 = Vaz2107.build(Car.Plates("123", 77))
     val vaz2 = Vaz2108.build(Car.Plates("321", 78))
 
-    repairEngine(vaz1)
-    repairEngine(vaz2)
+    repairEngine(vaz1 as VazPlatform)
+    repairEngine(vaz2 as VazPlatform)
 }
 
 fun repairEngine(car: VazPlatform) {
@@ -90,4 +91,26 @@ fun repairEngine(car: VazPlatform) {
         is VazEngine.LADA_2107 -> println("Чистка карбюратора у двигателя объемом ${car.engine.volume} куб.см у машины $car")
         is VazEngine.SAMARA_2108 -> println("Угол зажигания у двигателя объемом ${car.engine.volume} куб.см у машины $car")
     }
+}
+
+fun refuelCars() {
+    val cars: List<Car> = listOf(
+        Vaz2107.build(Car.Plates("123", 77)),
+        Vaz2108.build(Car.Plates("321", 78)),
+        Taz
+    )
+
+    val station = FuelStation()
+
+    for (car in cars) {
+        println("Собираемся заправить $car, Кол-во топлива: ${car.tankMouth.getContents()}")
+        val refuelResult = station.refuel(car.tankMouth, 10)
+        println("Результат заправки $refuelResult, Кол-во топлива: ${car.tankMouth.getContents()}, Машина: $car")
+    }
+
+    for (car in cars) {
+        println("Собираемся заправить $car, Кол-во топлива: ${car.tankMouth.getContents()}")
+        val refuelResult = station.refuel(car.tankMouth, 15)
+        println("Результат заправки $refuelResult, Кол-во топлива: ${car.tankMouth.getContents()}, Машина: $car")
+    }
 }
\ No newline at end of file