diff --git a/firmware/controllers/system_fsio.h b/firmware/controllers/system_fsio.h
index c17f44bc96..ede68a0d1b 100644
--- a/firmware/controllers/system_fsio.h
+++ b/firmware/controllers/system_fsio.h
@@ -1,6 +1,6 @@
 // this https://en.wikipedia.org/wiki/Reverse_Polish_notation is generated automatically
 // from controllers/system_fsio.txt
-// on 2020-10-07_19_21_50_355
+// on 2021-01-10_23_54_03_624
 //
 //
 // in this file we define system FSIO expressions
@@ -17,8 +17,13 @@
 
 // Human-readable: (fan and (coolant > cfg_fanOffTemperature)) | (coolant > cfg_fanOnTemperature) | is_clt_broken
 #define FAN_CONTROL_LOGIC "fan coolant cfg_fanofftemperature > and coolant cfg_fanontemperature > | is_clt_broken |"
+//
+// todo: we might have a bug here?
+// todo: 'time_since_boot' means 'getTimeIgnitionSeconds' in case of EFI_MAIN_RELAY_CONTROL like Proteus
+// and it's negative if ignition is off? does Proteus not get fuel pump start-up priming pulse?!
+//
 
-// Human-readable: ((time_since_boot >= 0) & (time_since_boot < startup_fuel_pump_duration)) | (time_since_trigger > 0)
+// Human-readable: ((time_since_boot >= 0) & (time_since_boot < startup_fuel_pump_duration)) | (time_since_trigger < 1)
 #define FUEL_PUMP_LOGIC "time_since_boot 0 >= time_since_boot startup_fuel_pump_duration < & time_since_trigger 1 < |"
 
 // Human-readable: vbatt < 14.5
@@ -36,8 +41,8 @@
 //needed by EFI_MAIN_RELAY_CONTROL
 //MAIN_RELAY_LOGIC=(time_since_boot >= 0 & time_since_boot < 2) | (vbatt > 5) | in_shutdown
 
-// Human-readable: (vbatt > 5) | in_shutdown
-#define MAIN_RELAY_LOGIC "vbatt 5 > in_shutdown |"
+// Human-readable: (!in_mr_bench) & ((vbatt > 5) | in_shutdown)
+#define MAIN_RELAY_LOGIC "in_mr_bench ! vbatt 5 > in_shutdown | &"
 // could be used for simple variable intake geometry setups or warning light or starter block
 
 // Human-readable: rpm > fsio_setting(1)
diff --git a/firmware/controllers/system_fsio.txt b/firmware/controllers/system_fsio.txt
index f12e75fe23..a5927efd8c 100644
--- a/firmware/controllers/system_fsio.txt
+++ b/firmware/controllers/system_fsio.txt
@@ -31,7 +31,7 @@ COMBINED_WARNING_LIGHT=(rpm > fsio_setting(2)) | ((coolant > fsio_setting(3)) |
 
 #needed by EFI_MAIN_RELAY_CONTROL
 #MAIN_RELAY_LOGIC=(time_since_boot >= 0 & time_since_boot < 2) | (vbatt > 5) | in_shutdown
-MAIN_RELAY_LOGIC=(vbatt > 5) | in_shutdown
+MAIN_RELAY_LOGIC=(!in_mr_bench) & ((vbatt > 5) | in_shutdown)
 
 # could be used for simple variable intake geometry setups or warning light or starter block
 RPM_ABOVE_USER_SETTING_1=rpm > fsio_setting(1)