What should the size of the fill pipe be, and how should it be pitched?

The correct choice regarding the size of the fill pipe and its required pitch is important for ensuring proper fuel delivery and preventing potential issues like leaks or backflow. A fill pipe that measures 1 1/4 inches is appropriate as it is standard for residential oil tanks, providing a balance between sufficient flow rate and manageable space requirements.

Pitching the pipe towards the tank is crucial because it helps to facilitate the flow of fuel into the tank without trapping air or causing blockages. This orientation minimizes the risks associated with fuel spillage and also reduces the chances of debris collecting in the pipe, which can impede flow and affect system performance. Proper pitching ensures that gravity assists in directing the fuel where it needs to go, thereby promoting efficient and safe operation of the heating oil supply system.

While the other choices may suggest different sizes or pitches, they do not meet the optimal specifications for fill pipes, which necessitate a direct and unobstructed path to ensure reliable operation and compliance with safety regulations.