Why do I have high fuel pressure...

[steve meltzer]

The rear mounted e-pump feeds into the mechanical pump. I would call this series and I dunno the ID of the lines, but they're all original. They are braided; I can measure the OD when I'm next out there. They feed a fuel log/rail with dual feeds to the Holley.

[patrickt]

Originally Posted by steve meltzer

The rear mounted e-pump feeds into the mechanical pump. I would call this series and I dunno the ID of the lines, but they're all original. They are braided; I can measure the OD when I'm next out there. They feed a fuel log/rail with dual feeds to the Holley.

Alright. No mechanical pump should be putting out 9psi. Your needle/seat valve in the 4160 bowls won't like that. Do a quick fuel pressure check right in front of the carb (with the electric pump OFF) and see if you really have 9psi or if your dash gauge is wrong. The goal will be to get a nice, even 6psi or so without having to switch on your electric pump.