If you are sure that the fuel consumption will increase (obviously) on the premise that only a new gasoline pump is replaced under other conditions unchanged, it may be that the ECU system of the original car has adapted to the response of your old oil pump, and the response of the new oil pump is more sensitive, so the ECU system gives the same oil delivery instruction according to the strength and frequency of your right foot and the fixed "oil-gas mixing ratio", while your new oil pump supplies more oil more sensitively, which leads to the increase of fuel consumption. If it is a short-term problem, you don't need to pay attention to it. BMW's ECU system will automatically adapt to and adjust the fuel supply habit, just like people who just quit smoking will suddenly gain weight and return to normal after a while. However, if you think it is necessary to deal with it, you can rectify it from two aspects: 1, cleaning the air flowmeter (thoroughly), which can make the input air ratio more sensitive and detailed, and can tolerate full combustion because of more oil supply, thus providing more power. When you feel full of motivation, you will naturally loosen the oil to save money. Just like you clean up the blood vessels and clean up the lungs together after the flow increases greatly, so that they can achieve their goals. 2. Adjust the "fuel-air mixing ratio" of the car to adapt to the new fuel supply agility with a new ratio, so that you can adjust the input air ratio according to your current fuel output habits to achieve balance. However, the new ones will become old, and it is not recommended to carry out the second rectification. You can weigh it yourself. Pay: ECU: electronic control unit, also known as driving computer, vehicle computer, etc. In terms of use, it is a special microcomputer controller for automobiles, also called a special single chip microcomputer for automobiles. It consists of microprocessor (CPU), memory (ROM, RAM), input/output interface (I/O), analog-to-digital converter (A/D) and large-scale integrated circuits such as shaping and driving, just like an ordinary single chip microcomputer.

The function of the electronic control unit is to calculate, process and judge the information input by the air flowmeter and various sensors according to the programs and data in its memory, and then output instructions to provide the fuel injector with electric pulse signals with a certain width to control the fuel injection quantity. The electronic control unit consists of a microcomputer, input, output and control circuits.

After all, ECU, like the human heart, is a vital unit. Some codes in ECU can be read by professional external programs, which can diagnose faults and input new calculation instructions, thus changing the working state of the engine.