Prakash Nulkar, who once worked at a company which made the fuel dispensing machines installed at petrol pumps, was arrested from Hubli in Karnataka yesterday, police said.
Earlier, police had arrested 23 persons including two pump owners in the case after raiding over 90 petrol pumps across Maharashtra.
The accused replaced the IC (integrated circuit) chips installed in the dispensing machines. The new chip ensured that the quantity of petrol dispensed would be a little less than what the display panel on the machine showed.
Further probe is on.