Fuel pressure builds after a short while Options

[Seabird]

Hello all!

Having some on going difficulties with my fuel system. Last time at the track I had a lean running condition when under load on the 1-2 bank. Swapped a gasket once back home and now can't replicate the problem.

Decided I was going to refresh a few components as a precautionary measure. Fuel regulator (as this is where the split happens between the left and right carbs), fuel pressure gauge (the old one was well old), and adding a spare carb to my track side spares.

Previously I had not had a problem with fuel pressure per the gauge. After swapping in a fresh Holley 12-804 and an oil filled gauge I was unable to regulate the pressure down to 3 psi. Was not able to regulated it lower than 15 psi for that matter.

A little research on the web indicated that the 12-804 and the higher pressure 12-803 sometimes get mislabeled. So I bought a rebuild kit which came with both springs. Swapped the new low pressure spring into the new regulator. Initially I could get the pressure in the 3 lb range but after a sort while the pressure would creep up. To make matters worse if I bounce the throttle I actually can watch the fuel pressure drop off (IMG:style_emoticons/default/hissyfit.gif)

The fuel pump is a Holley blue top so it has a max pressure of 14 psi.

My next track day is 2 Saturdays from now so I need to sort this soon. Has anyone else run across this before?

Thanks,

Miguel