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Hi Guys, is it necessary to retune after changing to a GTR fuel pump?

Simple question. not so simple answer...

Not if the standard pump was delivering the required amount of fuel as per the ECU. If the standard pump was under delivering, and the euc was tuned to compensate for that, then when you put the GTR pump in the car will run rich. So it will need retuning.

Hope that helps :(

Simple question. not so simple answer...

Not if the standard pump was delivering the required amount of fuel as per the ECU.  If the standard pump was under delivering, and the euc was tuned to compensate for that, then when you put the GTR pump in the car will run rich.  So it will need retuning.

Hope that helps :P

How about resetting ECU? Does that helps?

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