In our last post, we discussed the two main components of the fuel pump – the electronic component that reads the sensors and creates the display, and the mechanical component consisting the electric motor, valves, and the pump. We also discussed the suction system that most fuel dispensers use to pump fuel. In this post, we will go a little deeper and explain how the fuel dispenser measures fuel, and how the auto cutoff feature works.
Measuring the Fuel
Fuel pumps utilize a flow valve to measure the amount of fuel dispensed and regulate the flow. It works like a diaphragm that is squeezed to give the sensors information about how much fuel has passed by it. The information is then fed to the displays so you can see how many gallons of gas you have put into your car in real-time.
Auto Cutoff Mechanism
The auto cutoff feature of a fuel pump is a genius device that prevents you from overfilling your tank and getting gas all over your car and yourself. The fuel pump used a sensing tube that is connected to a mechanical value. When fuel touches the entrance of the sensing tube, the change in pressure triggers the valve to close, which stops the fuel from flowing into your vehicle.
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Fuel dispensers are interesting pieces of technology. You begin pumping gas into your vehicle, and somehow the pump knows when to turn off to avoid overfilling your tank and causing the gas to overflow. How does that work? Here is a quick guide to fuel dispensers in Texas that can help you understand the fueling process.
Two Main Components
Fuel dispensers are composed of two different components. One part consists of the electronics. This component controls the displays, reading from sensors in order to display the fuel volume and pressure. The second component is a mechanical system consisting of a pump and valves, and an electric motor that controls the fuel.
The most common fuel dispenser type works using unequal pressure to create suction. The lower pressure inside the fuel tank causes the fuel to push up the pipe to the nozzle. It is a surprisingly simple way to move the fuel, but it is incredibly efficient.
This is the basic mechanism for fuel dispensing systems. In our next post, we will discuss how the pumps measure fuel and how they know the exact moment to cut off the flow.
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