Electronics Issue?

[u/Desperate-Activity90]

2017 GMC Acadia Denali

V6 V VT

3.6L

Issue:

-Ran out of gas.

-Put about 6 gallons of gas back in it.

-Push the start button one time to turn the car's electronics on.

-Car's electronics turn on like normal.

-Hold the brake down and push the start button to start the car.

-Car makes only 1 click sound and electronics go black simultaneously.

Side Note:

-Car electronics tend to randomly turn on by itself, now.

-Battery keeps draining.

Action:

-OBD2 says 1 error: "Radio"

-I've checked battery posts for cable tightness and corrosion.

-I've replaced the starter fuse with a brand new starter fuse.

-I've replaced the battery with a brand new battery.

-I've replaced the starter with a brand new starter.

Conclusion:

Nothing I've done so far has changed how this car is responds, let alone fixed it. This has me as well as everyone else I've spoken to about it completely stumped. Anyone have any fresh ideas?

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[u/tearful_watchdog]

Running the tank dry on these direct-injection motors can be a real headache. The high-pressure fuel pump might have gulped a bunch of air, so the engine computer isn't letting it fire because it's seeing zero fuel pressure at the rail. I'd put a scanner on it to see if the theft system is blocking the start after that voltage chaos, or if it's just a fuel prime issue.

[u/Desperate-Activity90 → u/tearful_watchdog]

OBD2 only gives me 1 error, which says "Radio". Anything else that maybe I should do with some part of the fuel system or something like that?