Where is the car fuel pump installed?
2 Answers
The fuel pump is divided into a gasoline pump and an oil pump. The gasoline pump is installed inside the fuel tank, while the oil pump is installed inside the engine. Here is a related introduction to the gasoline pump: 1. Function: The function of the gasoline pump is to draw gasoline from the fuel tank and press it through the pipeline and gasoline filter into the float chamber of the carburetor. It is precisely because of the gasoline pump that the fuel tank can be placed at the rear of the car, far from the engine, and below the engine. 2. Working Principle: Currently, in most car models, the fuel pump is installed inside the fuel tank and is electrically driven. The fuel pump consists of three parts: the pump body, the permanent magnet motor, and the housing. When the permanent magnet motor is powered, it drives the pump body to rotate, sucking fuel from the inlet, passing it through the internal part of the electric fuel pump, and then pressing it out from the outlet to supply the fuel system. The fuel flowing through the electric fuel pump cools the armature of the permanent magnet motor, hence it is also called a wet fuel pump. The motor part of the electric fuel pump includes a permanent magnet fixed on the housing, an armature that generates electromagnetic torque, and a brush device installed on the housing. The brush is in contact with the commutator on the armature, and its lead is connected to the terminal on the housing, directing the voltage controlling the electric fuel pump to the armature winding. The two ends of the electric fuel pump housing are crimped tightly, assembling all components into an inseparable unit.
I used to work in auto repair, and the fuel pump is generally installed inside the vehicle's fuel tank, specifically integrated at the bottom or top of the tank. This design protects the pump from the engine's high temperatures and ensures quieter operation. You might wonder, what if it fails? That's right—the fuel pump is responsible for delivering fuel to the engine. If it's mispositioned or worn out, you may hear a humming noise during startup but the car won't start. For maintenance, avoid running the tank empty to prevent pump damage. Some older cars, like those from the 1990s, may have the pump mounted in the engine bay or under the chassis, but modern vehicles place it inside the tank. Replacement requires removing the tank or accessing it through the rear seat cushion.
