As the topic says. My static fuel pressure at idle seems to fall as the fuel or engine bay warms. Has anyone seen this happen? The pressure is checked with the regulator vac reference hose disconnected. What is the most likely cause? Could it be my fuel pumps or regulator failing? I have tested my pumps individually and both produce over 100psi maximum pressure. My tune is done at 38psi where the pressure is about the lowest. My injector duty remains consistent.

Here's my setup.
2 x Bosch 044 pumps
Aeromotive Fuel Pressure Regulator
1000pri 1600sec injectors
BW s366- 25psi boost

Any input appreciated.

 

At idle you are injecting the lowest amount of fuel through the injectors. Even if the voltage dropped, two Bosch 044 is providing you enough volume 10x over.

I would look at the regulator or fuel pressure gauge/sender as the most likely culprit.

 

Agreed, kinda leaning towards the gauge.