ok guys ive tried everything. i recently modded my fullblown housing to fit two walbro e85 450 pumps wired one to the stock wiring to get the base fuel presser of 45 and the other pump is wiring to come on at 15psi. and added a AEM fuel pressure regulator the regulator its completely open and at 3k the fuel pressure jumps to 100 every time like clock work, now i was thinking maybe at 3k the ecu gives the pump more voltage which could be the problem but is that something the tuner could adjust or do i have another issue and no the second pump isnt coming on.. im stumpped any input you guys could give me would be great.

 

https://www.evolutionm.net/forums/ec...ion-table.html

 

THANK YOU!!! now did you have the same problem that im having?

 

I don't have a double-pumper, but the W400 needs to have that table adjusted to keep from spiking the fuel pressure when that pump gets kicked up to full voltage.