When the fuel pump is broken, should the pump core or the entire assembly be replaced?

[StCharlotte]

When the fuel pump is broken, it is recommended to replace the entire assembly because the quality of replacing just the pump core cannot be guaranteed, and this is a very important component. The fuel pump is damaged mainly because the fuel filter has not been replaced for a long time, leading to severe blockage in the fuel supply system. This causes the fuel pump to work harder and remain in a high-load state for an extended period, ultimately resulting in its failure. The fuel pump is the component that draws gasoline from the fuel tank and delivers it through the pipelines and fuel filter to the float chamber of the carburetor. It is precisely because of the fuel pump that the fuel tank can be placed in the rear of the car, far from the engine, and positioned lower than the engine. Fuel pumps can be divided into two types based on their driving methods: mechanically driven diaphragm type and electrically driven type.

[Elle]

I've repaired quite a few cars, and fuel pump failures are pretty common. Replacing the entire assembly is a more reliable choice. Think about it—a fuel pump isn't just the pump core; it includes components like the fuel level sensor, float, housing, and more, especially in modern vehicles. If you only replace the pump core, you'll need to remove the fuel tank and deal with sealing rings, and if the workmanship is slightly off, it can easily lead to oil leaks or excessive noise. I've seen many car owners opt for a cheaper pump core replacement, only for it to fail again shortly after, costing them extra money and time. Although replacing the entire assembly costs a few hundred dollars more, it saves hassle and ensures a one-time installation with better compatibility and safety. Especially during high-speed driving, pump failure can lead to stalling risks, so you can't afford to be careless. I recommend visiting a professional shop—they'll assess based on your car model, but overall, a full replacement is still the best advice.