Do Fuel Pump upgrades increase fuel consumption?
When the Fuel Pump flow rate exceeds 30% of the engine demand, fuel pressure can exceed the 4.5bar original factory limit, and the ECU will adjust the fuel over-supply by shortening the fuel injection pulse width (typically 2.5ms→2.1ms), causing the air-fuel ratio to shift from the theoretical 14.7:1 to 12.8:1. The combustion efficiency is decreased …
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