I had to switch to the Walbro 255 HP pump in my Syclone.
The stock 190 pump barely keeped up w/the 280 HP rating.

One of the biggest improvements in the 1/4 mile on my Syclone.
Gained about 3 MPH & 2-3 tenths.
You have a wide band O2 reader?
Also do you have an adjustable FPR? Fuel pressure regulator.

MBHD

12 port SDS EFI