sanad maghaireh Posted September 12, 2017 Report Share Posted September 12, 2017 (edited) just wonder do i need a retune for upgrading my fuel pump from walbro 255L to 340L pump ?or replace it for another new one ? I have some problems in my current pump . BTW i have turbo civic with Atom ECU Thank you Edited September 12, 2017 by sanad maghaireh Quote Link to comment Share on other sites More sharing options...
Steve Posted September 12, 2017 Report Share Posted September 12, 2017 Depends. If the pump overruns the regulator pressure will rise uncontrolably and you wil run rich. That should be fixed if that happens. But a pumpswap by itself does not require a retune... Quote Link to comment Share on other sites More sharing options...
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