Installed my Walbro 250 pump in my M35 today and set up a power source direct from the battery to ensure full power to the pump at all times.
Reason for changing the pump was following the introduction of Nismo ECU, 3 inch suction pipe and spring on turbo actuator was seeing AFR being too high.
AFR's on medium throttle and below 4500rpm were all good and around 11.8-12.5 but higher rpm and more throttle saw AFR's is 13's.
So new pump fitted and now AFR's are much better at 10.7 to redline.
Now to start playing with boost again to see what the car will handle.