diff --git a/Software/MainBoard/rust/src/hal/battery.rs b/Software/MainBoard/rust/src/hal/battery.rs
index a387ac0..8de40c4 100644
--- a/Software/MainBoard/rust/src/hal/battery.rs
+++ b/Software/MainBoard/rust/src/hal/battery.rs
@@ -1,11 +1,13 @@
-use crate::hal::Box;
 use crate::fat_error::{FatError, FatResult};
+use crate::hal::Box;
 use async_trait::async_trait;
 use embassy_embedded_hal::shared_bus::blocking::i2c::I2cDevice;
 use embassy_sync::blocking_mutex::raw::CriticalSectionRawMutex;
 use esp_hal::i2c::master::I2c;
 use esp_hal::Blocking;
-use lib_bms_protocol::{BatteryState as bstate, BmsReadable, Config, FirmwareVersion, ProtocolVersion};
+use lib_bms_protocol::{
+    BatteryState as bstate, BmsReadable, Config, FirmwareVersion, ProtocolVersion,
+};
 use serde::Serialize;
 
 #[async_trait(?Send)]
@@ -59,18 +61,17 @@ impl BatteryInteraction for NoBatteryMonitor {
 pub struct WchI2cSlave {}
 
 pub struct WCHI2CSlave<'a> {
-    pub(crate) i2c: I2cDevice<'a, CriticalSectionRawMutex, I2c<'a, Blocking>>
+    pub(crate) i2c: I2cDevice<'a, CriticalSectionRawMutex, I2c<'a, Blocking>>,
 }
 
 #[async_trait(?Send)]
 impl BatteryInteraction for WCHI2CSlave<'_> {
-
-
     async fn get_state(&mut self) -> FatResult<BatteryState> {
         let state = bstate::read_from_i2c(&mut self.i2c)?;
         let config = Config::read_from_i2c(&mut self.i2c)?;
 
-        let state_of_charge = (state.remaining_capacity_mah * 100 / state.lifetime_capacity_mah) as u8;
+        let state_of_charge =
+            (state.remaining_capacity_mah * 100 / state.lifetime_capacity_mah) as u8;
         let state_of_health = state.lifetime_capacity_mah / config.capacity_mah * 100;
 
         Ok(BatteryState::Info(BatteryInfo {
@@ -95,4 +96,4 @@ impl BatteryInteraction for WCHI2CSlave<'_> {
     async fn reset(&mut self) -> FatResult<()> {
         todo!()
     }
-}
\ No newline at end of file
+}
diff --git a/Software/MainBoard/rust/src/hal/v4_hal.rs b/Software/MainBoard/rust/src/hal/v4_hal.rs
index 89b8c70..99bfc82 100644
--- a/Software/MainBoard/rust/src/hal/v4_hal.rs
+++ b/Software/MainBoard/rust/src/hal/v4_hal.rs
@@ -186,6 +186,8 @@ pub(crate) async fn create_v4(
     let pump_device = I2cDevice::new(I2C_DRIVER.get().await);
     let mut pump_expander = Pca9535Immediate::new(pump_device, 32);
     for pin in 0..8 {
+        let _ = pump_expander.pin_set_low(GPIOBank::Bank0, pin);
+        let _ = pump_expander.pin_set_low(GPIOBank::Bank1, pin);
         let _ = pump_expander.pin_into_output(GPIOBank::Bank0, pin);
         let _ = pump_expander.pin_into_output(GPIOBank::Bank1, pin);
         let _ = pump_expander.pin_set_low(GPIOBank::Bank0, pin);
diff --git a/Software/MainBoard/rust/src/main.rs b/Software/MainBoard/rust/src/main.rs
index 1891ea5..0fbe2ab 100644
--- a/Software/MainBoard/rust/src/main.rs
+++ b/Software/MainBoard/rust/src/main.rs
@@ -39,7 +39,7 @@ use embassy_net::Stack;
 use embassy_sync::blocking_mutex::raw::CriticalSectionRawMutex;
 use embassy_sync::mutex::{Mutex, MutexGuard};
 use embassy_sync::once_lock::OnceLock;
-use embassy_time::{Duration, Timer, WithTimeout};
+use embassy_time::{Duration, Instant, Timer, WithTimeout};
 use esp_hal::rom::ets_delay_us;
 use esp_hal::system::software_reset;
 use esp_hal_ota::OtaImgState;
@@ -642,17 +642,24 @@ pub async fn do_secure_pump(
     plant_config: &PlantConfig,
     dry_run: bool,
 ) -> FatResult<PumpResult> {
-    let mut current_collector = vec![0_u16; plant_config.pump_time_s.into()];
-    let mut flow_collector = vec![0_i16; plant_config.pump_time_s.into()];
+    const STARTUP_IGNORE_MS: u32 = 500;
+    const STARTUP_ABORT_CURRENT_MA: u16 = 1500;
+
+    let steps_in_50ms = plant_config.pump_time_s as usize * 20;
+
+    let mut current_collector = vec![0_u16; steps_in_50ms];
+    let mut flow_collector = vec![0_i16; steps_in_50ms];
     let mut error = false;
     let mut first_error = true;
-    let mut pump_time_s = 0;
+    let mut pump_time_ms: u32 = 0;
+
     if !dry_run {
         board.board_hal.get_tank_sensor()?.reset_flow_meter();
         board.board_hal.get_tank_sensor()?.start_flow_meter();
         board.board_hal.pump(plant_id, true).await?;
-        Timer::after_millis(10).await;
-        for step in 0..plant_config.pump_time_s as usize {
+
+        for step in 0..steps_in_50ms {
+            let step_start = Instant::now();
             let flow_value = board.board_hal.get_tank_sensor()?.get_flow_meter_value();
             flow_collector[step] = flow_value;
             let flow_value_ml = flow_value as f32 * board.board_hal.get_config().tank.ml_per_pulse;
@@ -672,7 +679,20 @@ pub async fn do_secure_pump(
                     let current_ma = current.as_milliamperes() as u16;
                     current_collector[step] = current_ma;
                     let high_current = current_ma > plant_config.max_pump_current_ma;
-                    if high_current && first_error {
+                    if pump_time_ms < STARTUP_IGNORE_MS
+                        && high_current
+                        && current_ma > STARTUP_ABORT_CURRENT_MA
+                    {
+                        log(
+                            LogMessage::PumpOverCurrent,
+                            plant_id as u32 + 1,
+                            current_ma as u32,
+                            plant_config.max_pump_current_ma.to_string().as_str(),
+                            step.to_string().as_str(),
+                        )
+                        .await;
+                        error = true;
+                    } else if high_current && first_error {
                         log(
                             LogMessage::PumpOverCurrent,
                             plant_id as u32 + 1,
@@ -722,12 +742,27 @@ pub async fn do_secure_pump(
                         error = true;
                         break;
                     } else {
-                        //e.g., v3 without a sensor ends here, do not spam
+                        error!("Error getting pump current: {err}");
                     }
                 }
             }
-            Timer::after_millis(1000).await;
-            pump_time_s += 1;
+
+            // Keep the loop period as close to 50ms (including sensor read + processing time) as possible.
+            // Always sleep at least 1ms to avoid a fully busy loop when we overrun.
+            let elapsed = step_start.elapsed();
+            let target = Duration::from_millis(50);
+            let sleep_time = match target.checked_sub(elapsed) {
+                Some(remaining) => {
+                    if remaining < Duration::from_millis(1) {
+                        Duration::from_millis(1)
+                    } else {
+                        remaining
+                    }
+                }
+                None => Duration::from_millis(1),
+            };
+            Timer::after(sleep_time).await;
+            pump_time_ms += 50;
         }
     }
     board.board_hal.get_tank_sensor()?.stop_flow_meter();
@@ -741,7 +776,7 @@ pub async fn do_secure_pump(
         min_current_ma: current_collector[0],
         flow_value_ml,
         flow_value_count: final_flow_value,
-        pump_time_s,
+        pump_time_s: (pump_time_ms / 1000) as u16,
         error,
     })
 }
diff --git a/Software/MainBoard/rust/src/webserver/mod.rs b/Software/MainBoard/rust/src/webserver/mod.rs
index fc57366..052b39b 100644
--- a/Software/MainBoard/rust/src/webserver/mod.rs
+++ b/Software/MainBoard/rust/src/webserver/mod.rs
@@ -18,7 +18,10 @@ use crate::webserver::get_json::{
 use crate::webserver::get_log::get_log;
 use crate::webserver::get_static::{serve_bundle, serve_favicon, serve_index};
 use crate::webserver::ota::ota_operations;
-use crate::webserver::post_json::{board_test, can_power, detect_sensors, night_lamp_test, pump_test, set_config, wifi_scan, write_time};
+use crate::webserver::post_json::{
+    board_test, can_power, detect_sensors, night_lamp_test, pump_test, set_config, wifi_scan,
+    write_time,
+};
 use crate::{bail, BOARD_ACCESS};
 use alloc::borrow::ToOwned;
 use alloc::string::{String, ToString};