Originally Posted by fast68plymouth
I forgot that thing was EFI.

I would think it would be even more important to insure the fuel pressure is constant with that set up.

What system are you running that operates at only 6psi(or did you mean 60psi)?

Edit: looking at the specs for the Walbro 255 pump, I’d say you’re at the point where it may just not be enough pump.
It’s rated for 630hp........ going by this:


Yes that is the pump I have, it is still Carbed, running a 6psi adjustable return regulator. it is an EFI set up tank, will go EFI as money allows

Last edited by csk; 04/21/19 04:10 PM.
1968 Charger COLD A/C Hilborn EFI
512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim
2020 T/A 392 Stock 11.79 @ 114.5