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Can you modify the pump itself? No.

But plenty of people have used tuning boxes to trick the sensors into injecting more fuel. The proper way to inject more fuel is to use a chip since this is more comprehensive than a tuning box. It's also possible on the TDIs to use a large pump, say 11 or 12mm vs. 10mm on manual transmission TDIs. But the larger you go, the more likely there will be complications.
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