1) mount the pump as close to the tank as you can with a EFI fuel filter before and after the pump (unless the tank has a pickup strainer - if so then omit the inlet filter. If your get the Earls AN to snaginaw adapters then you can use the GM TBI fuel filters same type that on the donor.
2) GM TBI's have the pressure regulator built in :).
3) The 4.3 TBI should be fine if you can tune the ECM. If you run the GM ECM it'll probably idle rich until its tuned.. kind of like Tom's truck when we did the impromptu EFI conversion at B'Ville last year. the cause was was a horrible vacuum leak that caused the MS to think the throttle was near WOT when it wasn't so it was dumping fuel in. It took some fast fingers to lean it out before it stalled.
4) holley sells a TBI to 4bbl adapter for about $30.
5) Er -6 line is plenty big. For low buck use a single braid hydraulic hose.. no need to spend $$$ on the fancy stuff. Both the feed and return need to be braided in case the return line ever plugs up the line pressure will rocket up > 50 psi.
Have you consider what your going to run for the ECM?
If you decide to run a MS with the GM '747 adapter board it just plugs into the GM harness with no modes and you can tune it with a laptop much much faster than guessing at a change and then burning eproms. :(-
Ask either Tom or myself if you need help...
Last edited by efi-diy; 02/12/0904:20 AM.
51 GMC 4.2 turbo Can't solved today's problems using the same technology/thinking that created them
