Is It Normal for a Newly Replaced Fuel Pump to Make Abnormal Noises?
2 Answers
Abnormal noises from a newly replaced fuel pump are not normal. The reasons for abnormal noises from a fuel pump are as follows: 1. The viscosity of the hydraulic oil is too high. 2. Improper installation of the fuel pump and motor, where the concentricity of the pump shaft and motor shaft is inconsistent, causing the pump shaft to bear radial force and generate noise. 3. The oil level in the tank is too low, or the suction pipe is blocked, increasing the suction resistance of the pump, leading to pump cavitation or air leakage in the inlet pipe section, causing the pump to suck in air and produce abnormal noises. Additional Information: Fuel pumps are suitable for transporting various types of oils, such as heavy oil, diesel, and lubricating oil. When equipped with copper gears, they can also transport low-flash-point liquids, such as gasoline and benzene.
If the newly replaced fuel pump is buzzing, it's definitely not right. I've seen mechanics operate during repairs, and if a new pump makes abnormal noises, it's most likely due to improper installation: either the fuel pipe clip isn't locked tightly, causing resonance, or the tank seal isn't pressed firmly, leading to air leakage. Once, a friend bought a cheap aftermarket pump, and the unstable fuel pressure made it as noisy as a drill—it broke down after just two weeks. The proper procedure is to use a diagnostic tool to check the fuel rail pressure; if it exceeds 380kPa at idle, there's definitely an issue. I suggest going back to the shop for a recheck while it's still under warranty. This thing is crucial for engine fuel supply—don't wait until it breaks down to deal with it.
