Ground Problems!

[bpatch85]

Background:
5.3L out of 2001 2wd Chevy Avalanche w/ 4L60e has been installed into an '82 CJ7 trail jeep.

Novak Adaptors programmed the PCM and modified the harness as well as supplied all hardware to mount and adapt the engine and trans into the CJ7.

All connections are made(I believe) on the harness to there appropriate locations except for the O2 sensors. No exhaust only headers.

I confirmed the injectors are getting power w/ a NOID tester and spark from the coils.

The PROBLEM that I need help w/ is that I suspect I am missing a ground somewhere. Reason being when I turn the ignition to the ON position the fuel pump does not turn on. I turn the key to start and the motor turns over but the pump never turns on and obviously doesn't fire.

However, when I connected an OBDII reader, that gets it's power by connecting directly to the battery, the pump kicks on and the engine fires and run as it should.

So with discovering this I remove the OBDII reader and back to no fuel pump running. This time I take a wire and go from the ground pin on the OBDII plug and ground it to the chassis. Once I do the the fuel pump kicks on for 2-3seconds in the "ON" positions, then start the motor and the engine fires and runs as it should. While the engine is running I remove the temporary ground and it dies.

Sorry if this is long winded but trying to give an idea of what I have going on.

So, where am I missing a ground? My head is spinning after going back to all the grounds I have installed and assuring they all are clean and have a good connection along w/ reading Brendan's website and all of the google searching.

Your help is appreciated.

Ben