What is a helpful step when bleeding and priming a diesel fuel system?

Ensuring that the fuel filters and strainers are full of fuel is a crucial step when bleeding and priming a diesel fuel system. This step helps to minimize the presence of air in the system. Diesel engines rely on a continuous supply of fuel that is free from air bubbles, as air can hinder proper fuel delivery and combustion, leading to starting difficulties and operational problems.

When the filters and strainers are filled with fuel, it helps establish a solid vacuum and creates a smooth flow of diesel to the injectors once the system is bled. This action reduces the risk of air pockets forming during the priming process, ultimately facilitating the engine's ability to start and run smoothly. Keeping the fuel system properly filled with diesel not only optimizes performance but also improves the longevity and reliability of the engine.

Attempting to bleed the system without ensuring the filters and strainers are full would likely lead to complications during engine startup, such as misfires or stalling, due to air entering the fuel system. Therefore, this step is fundamental in maintaining the health of a diesel engine.