Originally Posted by baronbob

Thanks for all the response to everyone. The back ground someone asked for is as follows: The engine is a Merc 7.4 MPI the system is a used M-1 with the red regulator (I think made by ATI). Ati can not come up with a part # for the regulator. They did sell me the correct re-build kit (diaphragm, 3 O rings and a spring). The problem did exist before the re-build. I put the regulator back together the same way with the large round plate on the top of the diaphragm and found that I did not have enough travel in the adjustment and then re-located the round plate to the bottom of the diaphragm resulting in pushing the needle further down with a given spring pressure. the needle does have a wear mark and I have asked ATI if I can purchase a new needle and seat. They do not know if they are sold separately, they don,t know the part # of the regulator or the needle/seat. They will not let me talk to the tech on the flow bench to see where the round plate goes. Anybody know?? Can or should I lap in the needle/seat with valve lapping compound? Or should I just Polish it on my lathe? How do you set the idle voltage referenced in one of these responses?

Originally Posted by Pantera28-650HP

Smitty -

What are the part numbers and approximate $$$ ?

Can you post a picture of the actual set up on the engine?

Thank you

Originally Posted by Turbojack

Orginal prorcharger regulator I had was for carbs, it worked perfect. Problem must be with the procharger efi regulator. When I went EFI I bought a aeromotive regulator & have had no problems with fuel pressure.

Originally Posted by Pantera28-650HP

Smitty -

Who makes the other regulator? Hope you get a chance to post pictures. I think this is part of my problem!!!

Thanks

Originally Posted by GPM

You might want to look at the Weldon, pumps, and regulators, you would only need one of each.