diff --git a/firmware/config/engines/custom_engine.cpp b/firmware/config/engines/custom_engine.cpp
index ed12ade1f8..3d82df208e 100644
--- a/firmware/config/engines/custom_engine.cpp
+++ b/firmware/config/engines/custom_engine.cpp
@@ -487,6 +487,10 @@ void mreBoardTest(DECLARE_CONFIG_PARAMETER_SIGNATURE) {
 	boardConfiguration->ignitionPins[7] = GPIO_UNASSIGNED;
 
 
+	// fuel pump is useful to test power on/off scenario
+//	boardConfiguration->fuelPumpPin = TLE8888_PIN_22;
+
+
 	// LED #1
     // GPIOE_7: "34 - GP Out 2"
 	boardConfiguration->injectionPins[1 - 1] = TLE8888_PIN_22;//GPIOE_7;
diff --git a/firmware/hw_layer/drivers/gpio/tle8888.c b/firmware/hw_layer/drivers/gpio/tle8888.c
index 5bd430361c..27eaac075d 100644
--- a/firmware/hw_layer/drivers/gpio/tle8888.c
+++ b/firmware/hw_layer/drivers/gpio/tle8888.c
@@ -360,7 +360,11 @@ int tle8888SpiStartupExchange(void * data) {
 	struct tle8888_priv *chip = (struct tle8888_priv *)data;
 	const struct tle8888_config	*cfg = chip->cfg;
 
-	chThdSleepMilliseconds(3);
+	/**
+	 * We need around 50ms to get reliable TLE8888 start if MCU is powered externally but +12 goes gown and then goes up
+	 * again
+	 */
+	chThdSleepMilliseconds(50);
 	/* Software reset */
 	// first packet: 0x335=821 > 0xFD=253
 	uint16_t response = 0;