All the seven petrol pumps have been sealed and about 14 people were being questioned in this connection, ASP (STF) Arvind Chaturvedi said today.
On a tip-off, STF sleuths last night picked up an electrician who used to instal these chips in petrol dispensing machines which reduced the fuel output, he said.
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Raids will also be carried out in other parts of the state as the STF has information that the chip has been sold to a large number of pumps, he added.
The chip costing around Rs 3,000 when installed in the dispensing machines reduced the output by nearly five to ten per cent. The chip is attached with a wire which is linked with a remote control that set the limit, the STF said.
If the dispensing machine is fitted with this chip, a customer will get only 940 ml petrol for the price of one litre.
"On an average, the petrol pumps using this device were earning an undue profit of Rs 14 lakh per month," the ASP said.
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