Car won't start, maybe fuel pump?

440 with sniper efi. Tried to start the car the other day but battery was apparently dead despite being on a charger. I could barely get 5v max out of it, it was only 4 years old. Replaced with a new optima battery yesterday and while the engine cranks over I didn't hear the usual sound from the fuel pump when I turn the ignition on. My little sniper screen just says "no data" across it instead of the usual instruments and I'm wondering if either my pump (which is only a year old) failed or if something needs reset on the computer due to the dead battery.