I have an Impulse turbo on my Apex. I was just wondering what the stock Apex fuel regulator should be setting the fuel pressure at. Mine seems high at 45 psi when the motor is not running and 44 psi with the motor running. I am seeing 7-8 in Hg vacuum on the boost gauge at idle. My understanding is the fuel pressure should be ~42 w/o motor running and 36.3 w/ motor at idle. I understand their may be an air leak or bad vacuum signal to the regulator at idle, but it seems odd that my pressure w/o motor running is 45. If someone can verify what their fuel pressure is w/o motor running I would greatly appreciate it. It shouldn't matter what turbo (or supercharger) kit you are running, as long as you are using the stock pressure regulator.
Apex fuel pressure w/ stock regulator
- Thread starter mutley531
- Start date
N
NM
Well-known member
Sounds about right. The lowest I have seen with engine running is 42. Some guys that use different cams that create more vac may see lower fp. If the gauge you are using is liquid filled then that can make a difference too depending on what elevation you do the test.
Thanks for the input. It seems mine is working like it should be. I was just wondering since the service manual calls for 36.3 psi w/ motor running and mine is higher though my vacuum at idle is in line with the manual (8 inHg). Unfortunately, the service manual only gives a value w/ motor running for correct fuel pressure. Thanks, again.