Why do I have high fuel pressure...

[steve meltzer]

First let me say that this by the dash gauge, not verified by checking the pressure with a pressure gauge. But, assuming it's not the gauge...Kirkham with Southern 427. Single Holley 4160/vac secondaries (Holley #0-3310C). Both mechanical pump and electric Holley.

I've owned the car for nearly 15 years and it's always run about 6 PSI at idle with either the mechanical or the mechanical + electric. On the road, same until about 3K RPM when, under load, the mechanical pump falters, dropping the pressure to 2-3 making the car stumble. Switching on the electric pump solves that problem and the pressure returns quickly to 6 and remains there, as long as the electric pump is on. Been that way forever, but now....

The car idles and cruises at 9 PSI, e-pump off. But still stumbled until I flipped on the e-pump and then it ran great. Weirdly, the gauge then showed about 8.5...a sl. tick lower, it seemed to me. Also, my idle seemed to have dropped from about 1050 or so to 850-900...causing the car to die without increasing the idle speed back to 1050.

Any thoughts, I understand high blood pressure way better than I understand high fuel pressure. thanx steve meltzer