As you know there are two types of fuel pumps. They are mechanical fuel pumps and electrical fuel pumps.
Most vehicles with carbureted engines use mechanical fuel pumps to transfer fuel from the fuel tank into the fuel bowls of the carburetor. Most mechanical fuel pumps are diaphragm pumps. Diaphragm pumps are located on the engine and are operated by eccentric cams on crankshafts. Mechanical pumps can be mainly seen in old cars.
Comparatively, in many modern automobiles the fuel pump is usually equipped with electric fuel pumps and located inside the fuel tank. Unlike mechanical fuel pumps that need to be located near the engine, electric fuel pumps can be placed anywhere in the car, but work the best when they are installed near fuel tanks. In electric fuel pumps, they create encouraging pressure in the fuel lines to push the gas to the engine. Electric fuel pumps are rapidly becoming more widely used than mechanical fuel pumps, but each type consists of own advantages and disadvantages. Vehicles that feature fuel injection systems occupy electric fuel pumps
If we consider about the pressure, Mechanical fuel pumps are designed to operate at pressures between 4 and 6 lbs. per square inch (psi). While electric fuel pumps, on the other hand, are capable of operating at pressures between 30 and 40 psi. This pressure output difference can be considered as the main comparison between mechanical and electric fuel pump. Even in electric fuel pumps there are two types. Namely, High pressure electric fuel pump and low pressure electric fuel pump. When you got to replace the electric fuel pump of your automobile be concern on that as well. As mentioned above, electric fuel pumps are generally located in the fuel tank to use the fuel in the tank to cool the pump and to ensure a steady supply of fuel.
Another significant difference between electric fuel pumps and mechanical fuel pumps are, since electric fuel pumps can run whenever they are switched on. So that it may lead to some dangerous situations if there is a leak due to an accident or some mechanical problem. In contrast, mechanical fuel pumps get turned off when the engine stops. Therefore, mechanical fuel pumps are comparatively safer that electric ones due to their low operating pressure.
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