Which of the following is not a likely cause of low system air pressure?

Which of the following is not a likely cause of low system air pressure?

• A. Lea​ks in the system
• B. Compressor oil in cylinders
• C. Under-sizing the compressor
• D. A blocked exhaust

Answer: (B)

System air pressure is determined by how well the compressor can deliver air and by losses in the system. Leaks let compressed air escape, so the pressure in the lines stays low. If the compressor is undersized for the demand, it can’t push enough air to reach or sustain the desired pressure. A blocked exhaust makes the compressor work inefficiently or stall, which also reduces the air actually available to the system. Compressor oil in cylinders is a lubrication issue; while it signals maintenance problems and can reduce overall efficiency or cause wear, it does not directly cause the system pressure to stay low during normal operation.

System air pressure is determined by how well the compressor can deliver air and by losses in the system. Leaks let compressed air escape, so the pressure in the lines stays low. If the compressor is undersized for the demand, it can’t push enough air to reach or sustain the desired pressure. A blocked exhaust makes the compressor work inefficiently or stall, which also reduces the air actually available to the system. Compressor oil in cylinders is a lubrication issue; while it signals maintenance problems and can reduce overall efficiency or cause wear, it does not directly cause the system pressure to stay low during normal operation.