Adjust fuel consumption so that it will operate whilever the diesel engine is running

Author: peternewell

Source/Orts.Simulation/Simulation/RollingStocks/MSTSDieselLocomotive.cs

@@ -636,18 +636,6 @@ protected override void UpdateTractiveForce(float elapsedClockSeconds, float t,
                         TractiveForceN = 0;
                 }
 
-                DieselFlowLps = DieselEngines.DieselFlowLps;
-                partialFuelConsumption += DieselEngines.DieselFlowLps * elapsedClockSeconds;
-                if (partialFuelConsumption >= 0.1)
-                {
-                    DieselLevelL -= partialFuelConsumption;
-                    partialFuelConsumption = 0;
-                }
-                if (DieselLevelL <= 0.0f)
-                {
-                    SignalEvent(Event.EnginePowerOff);
-                    DieselEngines.HandleEvent(PowerSupplyEvent.StopEngine);
-                }
             }
             else
             {
@@ -662,6 +650,24 @@ protected override void UpdateTractiveForce(float elapsedClockSeconds, float t,
                     w = 0;
                 AverageForceN = w * AverageForceN + (1 - w) * TractiveForceN;
             }
+
+            // Calculate fuel consumption will occur unless diesel engine is stopped
+            if (LocomotivePowerSupply.MainPowerSupplyOn)
+            {
+                DieselFlowLps = DieselEngines.DieselFlowLps;
+                partialFuelConsumption += DieselEngines.DieselFlowLps * elapsedClockSeconds;
+                if (partialFuelConsumption >= 0.1)
+                {
+                    DieselLevelL -= partialFuelConsumption;
+                    partialFuelConsumption = 0;
+                }
+                // stall engine if fuel runs out
+                if (DieselLevelL <= 0.0f)
+                {
+                    SignalEvent(Event.EnginePowerOff);
+                    DieselEngines.HandleEvent(PowerSupplyEvent.StopEngine);
+                }
+            }
         }
 
         /// <summary>

Source/Orts.Simulation/Simulation/RollingStocks/SubSystems/PowerSupplies/DieselEngine.cs

@@ -1085,7 +1085,8 @@ public void Update(float elapsedClockSeconds)
             if ((State != DieselEngineState.Starting) && (RealRPM == 0f))
                 State = DieselEngineState.Stopped;
 
-            if ((State == DieselEngineState.Stopped) || (State == DieselEngineState.Stopping) || ((State == DieselEngineState.Starting) && (RealRPM < StartingRPM)))
+            // fuel consumption will occur when engine is running above the starting rpm
+            if ((State == DieselEngineState.Stopped) || ((State == DieselEngineState.Stopping) && (RealRPM < StartingRPM)) || ((State == DieselEngineState.Starting) && (RealRPM < StartingRPM)))
             {
                 ExhaustParticles = 0;
                 DieselFlowLps = 0;