Drivers using Morrisons petrol stations are being told to watch out after pending charges increased from £1 to £100.
Drivers using the supermarket's "pay at pump" service need to undergo a pre-authorisation check to ensure they have enough funds to cover the cost of fuel.
As it stands, motorists need to enter their card and punch in their PIN number before they can fill up.
The bank then protects a sum, previously £1 but now £100, to cover the final cost.
But since the change, some shoppers say the temporary charge has left them overdrawn for a number of days.
One woman said she visited a Morrisons station with enough funds to cover £30 of petrol.
But the large authorisation charge led her account to show -£20 into her overdraft.
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And it took another two days for this to be rectified and the money to be made available again, she said.
Another annoyed shopper said: "I had this too in Redditch and visited the store three times and it’s still not back in my account five days later.
Another said: "Wow, didn’t even know this, will always pay inside from now on."
One person warned others to take special care when "paying at the pump".
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Another wrote: "Be aware! Morrisons pay at pump petrol are pre authorising a payment of £100! I didn't realise as it was usually £1 there but I left the garage -£100 plus the cost of my petrol.... I know they will refund in 48 hours but still.... that was not expected."
Sainsbury's and Tesco shoppers faced similar issues last year.
The change has actually been implemented by card providers Visa and Mastercard, rather than the supermarkets.
The cash is only guarded temporarily, but it cannot be used until the final accurate amount is charged.
Morrisons has advised customers worried about the charge to pay inside the station rather than relying on pay at pump.
Alex Neill, who is CEO of complaints and claims specialists Resolver, urged customers to flag the issue as soon as possible.
He told The Sun : "If you find that the charge has not been released or refunded after a day or two contact your bank or credit card provider immediately, explaining what has happened.
"You should get an immediate reversal of the funds."