help with 91 lumina 3.1 v6

hi guys
I have a prob with my 91 lumina 3.1 v6
it will not start will turn over but not start,BUT haha if I jump the OBD port and then let it run a scan and then unjump it will start.:banghead::banghead::screwy:
I put in a new fuelpump, new filter,fuel pesr is 41psi when ing key is turned on 38psi when running.fuel pres does not drop when testing.got spark,will start after running,but after cool down it will not start and I need to jump the OBD port aging to start and no I do not have the port jumped when starting:icon16:

thanks for any help

When you jump the OBD plug, do you have any stored codes?

no codes,I just let it blink like 2min
but to start it I just let it blink 6 times
I dont know whats up with it