New option for fuel pump replacement

[5ABI VT]

Originally Posted by Hog

If you were able to view your WOT fuel pressure I'm thinking it would be ramping up during those periods when you are getting back on the throttle after you upshift.
As soon as you go WOT the ECM would be commanding very high pulsewidths, with all 16 injectors firing the fuel system is fighting to supply them with fuel and it takes a moment to get the fuel pressure back up.
Throwing some powershifts would eliminate your issue I'm guessing as the throttles remain open and there is no ramping up to full power. You would be looking for just under 52 psi at all times, IIRC the OEM regulator is set at 51.8psi for LT5.


A fuel pressure gauge taped to the windshield would tell the tale.


Cutting open fuel filters is a good idea as well. It doesn't take much to start to plug these high pressure fuel systems. I had a 66psi OEM GM system that woudnt rev over 4500rpm at WOT, I was surprised what was in the filter.






Mr Haibeck says that you require 51psi plus or minus 1 psi at WOT 3000-7000rpm. If you see less that 47psi of WOT fuel pressure, reduced power and knocking and possible codes can result. He agrees with talking her for a spin with the gauge taped to the windshield, he does make a good point to use a passenger though. The fuel pressure should snap up to 51 +/-psi (from around 43psi during normal driving when engine vacuum is high) when you stand on the throttle, then you know the FPR is working, or if you are at idle and you disconnect the vacuum supply to the FPR, you will see 51psi or so.

I looked briefly for a fuel pressure gauge to tape to the windshield but am not sure what the fitting size is etc. is it the same as an LT1 ? The car never hesitated like that before (few runway events on YouTube I have have no lag whatsoever) I have a few videos I won't post because we were being naughty on the highways at night but the hesitation was much more prominent. It still pulls decent with the hesitation but something is going on.