loping after fass 95 install and injectors

[MarylandDmax]

so i just got done doing injectors and a fass 95 install, and the truck is loping most noticeably when coming to a stop. i have watched the desired vs. actual fuel rail pressures and when the truck is warm they are close, and the actual is +/- 2 psi. when i first start the truck the actual is much much higher than the desired. when i did my fass install i did a factory fuel filter delete from fass and installed a gauge there. when the truck is at idle the gauge bounces around like crazy, so i dont know if it is my FPR or inconsistent flow from the fass.

 

[bfmine]

Try adjusting the psi of the fass I don't remember the right psi for lb7 but I want to say it should be 9psi

 

[Ne-max]

X2. Every lift pump I ever installed was set to high.

 

[Dirtymaxx03]

turn lift pump pressure down

 

[dirtydmax]

Pull the pump fuse and see if the lope stoppes..

 

[MarylandDmax]

So I talked to fass, adjusted the pressure down and the fluctuating pressure is gone and steady at 9 psi

 

[Ridin'GMC]

LB7 do not like high lift pump pressure, it causes them to lope any higher than 10 psi. The LBZ can run at 14 psi without any lope issues.

 

[kidturbo]

X2 on the 10psi cap... However I never knew that about the LBZ and 14psi without issue. Learned something new today. Must be that diff regulator design.

I successfully ran 12-15psi on the LLY boat engine after remapping the reg curve a bit, and raising my idle pressure to 50-60Mpa. I've also removed the dreaded regulator lope on a couple buddies trucks without lift pumps by that same trick.