diff --git a/firmware/controllers/algo/engine.cpp b/firmware/controllers/algo/engine.cpp
index d68451eb7f..1e293a116e 100644
--- a/firmware/controllers/algo/engine.cpp
+++ b/firmware/controllers/algo/engine.cpp
@@ -315,6 +315,7 @@ void Engine::watchdog() {
 
 void Engine::prepareFuelSchedule(DECLARE_ENGINE_PARAMETER_F) {
 	int rpm = rpmCalculator.rpmValue;
+	efiAssertVoid(ENGINE(engineConfiguration2)->injectionEvents != ENGINE(engineConfiguration2)->processing, "fuel pointers");
 
 	ENGINE(m.beforeInjectonSch) = GET_TIMESTAMP();
 
diff --git a/firmware/controllers/algo/engine.h b/firmware/controllers/algo/engine.h
index 45208c2ae7..e58d486fdd 100644
--- a/firmware/controllers/algo/engine.h
+++ b/firmware/controllers/algo/engine.h
@@ -70,9 +70,18 @@ public:
 	engine_configuration2_s();
 
 #if EFI_ENGINE_CONTROL || defined(__DOXYGEN__)
+	/**
+	 * Lock-free multithreading: two instances, while one is being modified another one is used read-only
+	 */
 	FuelSchedule injectionEvents0;
 	FuelSchedule injectionEvents1;
+	/**
+	 * this points at an instance we use to run the engine
+	 */
 	FuelSchedule *injectionEvents;
+	/**
+	 * this variable is pointing at the instance which is being modified
+	 */
 	FuelSchedule *processing;
 #endif
 
diff --git a/firmware/controllers/algo/engine_configuration.cpp b/firmware/controllers/algo/engine_configuration.cpp
index fb3e22a2a0..5cb8bc75a8 100644
--- a/firmware/controllers/algo/engine_configuration.cpp
+++ b/firmware/controllers/algo/engine_configuration.cpp
@@ -915,8 +915,8 @@ void resetConfigurationExt(Logging * logger, engine_type_e engineType DECLARE_EN
 }
 
 engine_configuration2_s::engine_configuration2_s() {
-    injectionEvents   = &injectionEvents0;
-    processing = &injectionEvents0;    
+    injectionEvents = &injectionEvents0;
+    processing = &injectionEvents1;
 }
 
 void applyNonPersistentConfiguration(Logging * logger DECLARE_ENGINE_PARAMETER_S) {
diff --git a/firmware/controllers/core/fsio_impl.cpp b/firmware/controllers/core/fsio_impl.cpp
index a235b45ac6..306651654b 100644
--- a/firmware/controllers/core/fsio_impl.cpp
+++ b/firmware/controllers/core/fsio_impl.cpp
@@ -156,6 +156,7 @@ void setFsio(int index, brain_pin_e pin, const char * exp DECLARE_ENGINE_PARAMET
 }
 
 void applyFsioConfiguration(DECLARE_ENGINE_PARAMETER_F) {
+	userPool.reset();
 	for (int i = 0; i < LE_COMMAND_COUNT; i++) {
 		brain_pin_e brainPin = boardConfiguration->fsioPins[i];