How can you diagnose a fuel delivery issue?

Diagnosing a fuel delivery issue is best accomplished by using a pressure gauge. This tool allows you to measure the fuel pressure in the system, helping you identify whether the fuel pump is functioning properly and if there are any blockages or leaks in the fuel lines. Correct fuel pressure is essential for the efficient operation of the engine; if the pressure is too low or too high, it can lead to performance problems, poor fuel economy, or engine stalling.

In contrast, checking oil levels, examining tire pressure, and inspecting brake pads are not relevant to diagnosing fuel delivery problems. These tasks pertain to different systems and components of a vehicle. Oil levels relate to the engine lubrication system, tire pressure affects handling and safety, and brake pads are critical for vehicle stopping power. These components do not provide any insights into the fuel system's functionality and, as such, do not play a role in identifying issues with fuel delivery.