just to be clear... at idle you should see 43 on the rail.
on boost you should see 43 plus whatever you are boosting.

(for simple math)
if you have 40 psi of fuel pressure at idle, and you boost 40 psi, then you should have 40+40 = 80 fuel pressure when at 40 psi boost.

if your fuel pumps cant keep up, you will see less then the 80 on the rail.
when i had fueling issues, running 40 psi boost, i was seeing around 75 psi on the rail.

 

Rewired with a Hobbs switch activated at 15psi

 

Wow thank you peeps you are very helpful! And knowledgeable

 

On to the next things! I really need to learn to tune my own evo what are your suggestions?

 

What do you think my turbo is capable of pushing with the supporting mods Gt35r ballbearing. I’ve seen 680 hp on virtual dyno with duty cycle at 100% and at 38psi! Is that what I should push for to stay around 38psi I’d boost and 680hp/520torque?

 

Yes they are capable of that power depending on mods, setup, and fuel. A buddy of mine is at the power level on E85 with a 35r variant.

 

OftenSaid Fred doesn't know how to not flame people and stop acting like an antagonistic windbag on the forums.

2 week vacation and a Merry Christmas to Evom!

 

Topic reopened.

 

43psi is with the vac line removed, that's your base pressure. Add in vacuum and it will drop depending on how much vacuum your engine makes. Fuel pressure is always base pressure + manifold pressure (with vacuum you're adding a negative number, so it subtraction).