1995 zj start up problem

Hello, I just bought this off a guy I knew. knowing I would have to address this. Only flash code is 12 Okay so it has trouble starting. You turn it on, listen to the pump, it sounds like the relay clicks. The engine light blinks. Sometime it takes a few tries, it runs good after. Any input? It's a 1995 5.2





It's much worse in cold,



Any thoughts please