What is a possible cause for an excavator motor not starting after refilling the diesel tank?

A possible cause for an excavator motor not starting after refilling the diesel tank is air in the fuel system. When the fuel tank is completely filled, it can sometimes lead to the introduction of air into the fuel lines. This can happen if there are any leaks in the system, or if the tank was run too low before refilling. Air in the fuel lines prevents the diesel fuel from reaching the engine properly, which is essential for combustion to occur. If the engine doesn’t receive the correct fuel supply, it will fail to start.

Proper function of the fuel system relies on a steady supply of fuel without air bubbles. Starting issues can often be resolved by bleeding the fuel system to remove any trapped air, ensuring that fuel flows smoothly to the engine. Understanding this concept is crucial for diagnosing and troubleshooting issues that may arise after refueling an excavator.