Petrol pump 'hack' that could save you a repair bill - Select Car Leasing
4.9 out of 5 42,627 reviews

Mon to Fri: | Sat:

Petrol pump 'hack' that could save you a repair bill

Here's a simple way to claw back some cash when you fill up your tank – don’t aim for an even number.


Millions of Brits like to level off their petrol purchase at a nice round pound.

But motoring experts are urging people to forget about neat figures and stop as soon as the pump clicks to a halt for the first time.

Graham Conway, managing director of leading UK leasing firm Select Car Leasing, said: 

“Squeezing the fuel pump after the first click, also known as ‘topping off’, might seem like the right thing to do so you can make it up to the nearest pound, but it’s really not.
“That’s because it’s likely to still dispense some fuel that won’t end up in your tank.
“If you ignore the first click you could be filling past the top of the fuel tank port, and that extra fuel will end up running into the small drain under the entry and onto the ground beneath your vehicle.
“On some pumps the extra fuel may be sucked back into the pipe. This means you are paying the petrol station to give them back their own fuel.
“A more serious issue, one that could damage your car and cost you serious cash, is connected to the vapour recovery system.
“This prevents evaporated petrol or diesel escaping when you release the petrol cap to fill up, capturing it in a charcoal canister instead.
“But if you are forcing surplus petrol or diesel into the tank, this can propel liquid fuel into the pipes and damage the vapour recovery system.
“That means you will soon see warning lights on your dashboard and run the risk of failing emissions tests.
“You’ll also be looking at an expensive repair bill, possibly up to £500. That’s something definitely worth avoiding during the current cost of living crisis.”


The habit of filling up to a certain monetary value is decades old, dating back to when all transactions were done with cash.

That meant putting exactly £20 of fuel in the tank would see you simply handing over notes to the cashier instead of having to dig around in the glovebox to locate loose coins.

But with the vast majority of people now paying on credit or debit cards, and many using the common ‘pay at pump’ facility, there’s much less need to hit a specific mark.

A thread on forum-hosting platform Reddit discussed the subject, with some revealing insights.

One user wrote: 

“I just fill the tank to the brim. However when I look around at other pumps, it seems like most other people do try and aim for a round number – I'd say around 3 in 4 pumps have one (or close to one). I don't really understand why you would do that.”


Select Car Leasing’s Mr Conway said: 

“Many people have a slightly obsessive compulsive side to their character, so it is understandable that they want to hit a nice round number.
“But with the majority now shunning cash for cards, and even phone-paying apps such as Apple Pay and Google Pay, there is less need to be so accurate.
“It also removes the frustration of carefully trying to get to a certain mark and the counter somehow ticking over by a penny – an experience most will have had at some point.”

Fuel prices are currently at their lowest level since May after a year of escalating costs across the board.

According to the Department for Business, Energy and Industrial Strategy (BEISS), last week the average price of petrol was 163.8p per litre with diesel at 180.3p per litre.


 Enjoyed this? Read our latest news:

Where To Next?

For all the latest reviews, advice and new car deals, sign up to our newsletter.

Looking for a great leasing deal? Check out our incredible range of special offers.

Read our latest reviews and find the right model for you.

Want to know more about leasing? Take a look at our comprehensive leasing guides.

Interested in everything motoring? Why not catch up on all the latest car leasing news.

Useful links

Don't just take our word for it. We're rated at 4.9/5 on independent reviews website Trustpilot from over 42,601 genuine customer reviews
Connor Esberger was an extremely good contact throughout my leasing process. Very responsive and helpful. I can't thank him enough. However, the process wasn't straight forward and it made it frustrating for myself and Connor. Unfortunately the vehicle was very late in being delivered with so many bumps along the way with the Portal system incorrect and misinformation being given by others. We got there in the end however and I am now delighted with my new vehicle. I will use Select Car Leasing again and hope that it will be smoother next time and that my delivery experience is out of the ordinary.
Mrs Cheryl Finch

Wednesday, 07/05/2025

Our website uses cookies

Our website uses cookies to distinguish you from other users of our website. This helps us to provide you with a good experience when you browse our website and also allows us to improve our site. For detailed information on the cookies we use and the purposes for which we use them see our Privacy policy.

Accept and closeLearn more about our privacy policy