The diagrams have different regulators shown/PN's, so kind of confusing and is why I recommend sticking with the instructions and not wory about it. Instructins say use 886 or 882 on the return. We are supplying TMI for a TBI
SOME so called instructions show carburetors. Diagram just says bypass regulator, no PN.......don't mention EFI plumbing.
Some showing same diagram for Holley 12-803BP. Low pressure adjustable regulator plumbing..... and talk about needle and seat.
