Z32 Fuel pump/controler going bad?

[sky Z]

Some days ago my car have start to make +12 AFR on WOT

it was running fine at 11.5 AFR in WOT and i log the nistune and the target AFR is around 11.3, also log some runs and all the other sensors( MAF etc) are fine.

Injectors, fuel filter, fuel regulator is new.

The fuel pump/controler and damper are stock whit around 93k miles

On cruise it runs fine around 15 AFR,

On part part throttle also runs fine around 13s

The TT fuel pump controler are 3 speed flow, is it possible the controler is bad only when it need max flow? or is the fuel pump that is dying?

in my older logs when the AFR was around 11.5 the injector time (green line) always keep up whit rpm/maf



And now when it needs more fuel it can´t keep up and the injection time falls

[Torque]

Hi,


Connect a voltmeter to the fuelpump and check the voltage while driving.

But initially I would check the fuel pressure.

[Matt]

Agreed check fuel pressure at idle and when on boost (can apply pressure to fuel regulator vacuum input to open it up using a syringe)