I would still think that you need to start from the first step.. stock file and apply the 2 and or 3 bar enhanced and save it. then make your changes and flash the pcm and see what happens.
have seen a few that for what ever reason did not set right with the 1st apply and had to try it again. I have also uploaded a segment swap to hptuners forum and someone else downloaded it and flashed it with bad results. after redownloading it and flashing it it worked great for them.
Still haven't fixed the one I tuned. I reflashed it and it still randomly does the no start issue.
I haven't tried the last one yet.. but will maybe tonight.
So far i've plugged in the VCM scanner, when i click fuel pump on it comes on for 5 seconds.. so it's not a mechanical problem. ( i can rule out fuel pressure regulator?? )
have tried to put the stock file on the computer. still won't fully some on and go through the prime cycle, then upt the 2 bar OS on that file, made changes.. nothing.
RPS-Man, i was hoping for your success that sounds like an awesome vette.
I have even thought of getting another ECM and trying it.driving me crazy
if you turn on the fuel pump with the scanner it stays on for 5 sec and shuts off??
if you turn the fuel pump on with the scanner it should stay on until you click off! I use it to drain the fuel tank on cars for fuel pump replacement all the time..
yes you can rule out the regulator..
i had a similar issue on my transplant. also googles right on with using the scanner for running the pump. it should not shut off until you say so. i had a bad brand new relay right out of the package from advance auto. it worked for about a day and then tapered off to nothing. i thought my new pump died until i ran the fuel pump signal full time. FDEusing the scanner to troubleshoot fuel system bugs is damn handy.