The computer seems to be ok

What is that?  That is not an ECM for a trackick.  A trackick ECM has a gray painted metal case and has 2 wiring plugs that plug into it.  That looks nothing like that.

Can you tell me where the fuel pump relay is located ?

On a bracket on the underside of the ECM (the ECM is on a bracket located in behind the drivers side front stereo speaker).  The fuel pump relay will have a connector that has at least one pink wire running to it.  The other identical relay that is next to the fuel pump relay is the main relay.

They must of moved them in the later trucks, I would swear mine was under the hood,
I jumpered the relay plug to run the fuel pump with the engine off to do some fuel PSI
testing when I was building the turbo setup, that was like 8 years ago, so you see why
I wasn't sure which one it was

Wild

They must of moved them in the later trucks, I would swear mine was under the hood,
I jumpered the relay plug to run the fuel pump with the engine off to do some fuel PSI
testing when I was building the turbo setup, that was like 8 years ago, so you see why
I wasn't sure which one it was

Wild

Nope, they are all right by/under the ECM.