I will be running Lonnie's double pumpers on my D1SC 383 and was just thinking and thought I would ask a stupid question!! If this sounds dumb, I will apologize up front.

I will be running the dual walbro setup on a boost refrence "Hobbs" switch. When we start tuning will there be an issue when the 2nd pump "kicks on" with fuel pressure spiking? I would ask Lonnie, but I have questioned him to death. Although he has gone above and beyond in ansering all my questions no matter how big or little. He is a great guy.

Anyway, just thinking when I shouldn't!!

 

Yes there will be a small pressure spike(5psi) when the second pump kicks on. I never really noticed it affecting the AFR that much.

 

wouldnt the computer just see that through the o2s and correct for it? guess il find this out too as i have a boost referenced FPR.

 

No the O2's won't see it at 4psi when the second pump kicks on. It will be in PE mode at that point. It is such a small spike that it really is not a big deal. It will just go slightly rich for a split second.