What is the likely consequence of running a Thermo King unit without sufficient fuel?

Running a Thermo King unit without sufficient fuel can lead to potential engine stalling and fuel system damage because the engine relies on an adequate supply of fuel to operate properly. When fuel levels are low, the engine may not receive enough fuel to maintain consistent performance, which can cause it to stall or shut down entirely. Additionally, low fuel conditions can lead to fuel pump overheating due to insufficient cooling and lubrication, ultimately causing damage to the fuel system components.

In contrast, having insufficient fuel does not lead to increased engine efficiency, and while it could theoretically lead to increased emissions due to incomplete combustion, the primary concern is the immediate impact on engine operation and potential stalling. Engine overheating would more likely result from prolonged operation under a heavy load without adequate cooling, rather than directly from low fuel levels. Therefore, the most likely consequence of operating a Thermo King unit with insufficient fuel is the stalling of the engine and the potential for damage to the fuel system.