What is the correct process for bleeding a fuel system?

The correct process for bleeding a fuel system involves opening the bleed screws, pumping the primer bulb until fuel flows steadily without any air bubbles, and then tightening the screws. This process is essential for removing air from the fuel lines, which can prevent the engine from starting or running efficiently.

When you open the bleed screws, it allows any trapped air in the fuel lines to escape. By pumping the primer bulb, you pressurize the fuel system and encourage fuel to flow towards the engine. As you continue to pump, once you observe a steady stream of fuel without bubbles, it indicates that the air has been purged from the system. Finally, tightening the bleed screws ensures that the system is sealed and operates effectively without leaking fuel.

Other methods mentioned, like emptying the fuel tank or purging the fuel line with air, do not effectively address the air trapped in the fuel lines. Additionally, disconnecting the fuel line to clean the filter may be necessary maintenance but is not a direct step in the bleeding process itself. The correct sequence of actions focusing on the bleed screws and the primer bulb is what makes option B the preferred procedure for bleeding a fuel system.