Gas station operation / Fuel pump operation

When you refuel your expensive (very expensive) car with a pistol in hand, have you ever wondered how it goes from the tank to yours? Of course, knowing the answer doesn't change the price paid, but it can be fun for a full tank! From a pistol to a calculator through a piston pump, let's lift the curtain over a mechanism that pumps both fuel and your money so quickly!

Mechanical action of the fuel pump

Your service station's fuel pump, also called volucompteur in professional jargon, is ultimately just a collection of simple technical gadgets. Let's see what the main part of the gas pump consists of, or in other words its mechanical part.

The first device is, of course, the engine. This drives the hydraulic unit, the true heart of the flow meter, which consists of:

– Positive Displacement Pump: This important part is the one that (as the name suggests) sucks fuel into the tank to send it back to your tank. It operates continuously but only draws in fuel when requested by the user.

– Bypass or non-return valve: stops the suction of fuel into the tank. It is this valve that allows the pump to operate continuously in a closed circuit after your request is satisfied.

– Vacuum pump: or vapor recovery system. Mandatory for "unleaded" fuel, this pump draws vapor from the gun and returns it to the tank as part of pollution control.

– Two floats: they are used to regulate the fuel and air flow. This is to ensure that the pump only supplies you with gasoline or diesel, not oxygen.

In addition to these mechanical devices, the fuel pump is, of course, equipped with counting devices, allowing you to pay the right price (but, unfortunately, rarely the desired price ...).

EMR: Or let's get to the money!

The purpose of an EMR or road measurement system is to measure, calculate and then send the price of your fuel to a payment terminal.

In this set, the part most controlled by the DRIRE (Regional Office for Industry, Research and the Environment) is the meter. Each pistol has its own counter, which, using a system of pistons, determines (with a reserve of 1 liter per 1000 liters) the amount of fuel supplied.

Next comes the transmitter. Each measurement tower sends a signal to a transmitter, which then converts it into an electrical signal, which it transmits to a computer. Then the calculator adds up the amount according to the price per liter, transfers it to the cashier and displays it on the pump. It is thanks to him that you know the amount that you have to pay in real time.

And the last device is, of course, the pistol, which, connected to the pump with a hose, allows you to pour the precious liquid into your reservoir. It is on this gun that the “Venturi system” is located, which prevents overfilling when your tank is full. Equipped with an air intake, this device effectively blocks the distribution when the fuel level overlaps it.

This is probably what you will think about the next time you watch the pump clock turn!

All comments and reactions

Dernier comment posted:

FÃ © line (Date: 2021, 05:22:20)

Hi,

I am contacting you in connection with fears that this is happening at the total access station, where water seeped into the tanks of the gas station, which led to the breakdown of several dozen vehicles. The problem was recognized by the "transnational company Total", I have already submitted a preliminary application to the Total support service using the toll-free number provided by the station (date, time, fuel consumed). ©, payment method), The rest of the documents now need to be sent by e-mail (Explanatory text about the progress of the breakdown, gray card of the damaged vehicle, REPAIR INVOICE and receipt (possible duplicate))). I would like more information on the progress of the procedure so that, for example, to know if checks are being carried out on the vehicle, to see if work has actually been done on the damaged engine. Thanks for your feedback.

Il I. 2 reaction (s) to this comment:

• Administrator SITE ADMINISTRATOR (2021-05-24 15:36:28): This is beyond my purview ...
• Abdallah (2021-07-30 14:26:23): Bjr, I'm here to ask a question. So what can cause the index to drift with good results?

(Your post will be visible under the comment after verification)

Write a comment

What do you think about the evolution of the Golf?