Mercedes Benz W163 ('99 ML430)?

Just picked up my '99 ML430 and it has been having issues with the fuel gage. After filling it up, it reads empty. Not sure why this happens, I'll give it time, but why is this happening?

And each time I put in my tape that converts my music from my iPhone, it gets rejected and comes back out. Suggestions?!

Lexus

OBVIOUSLY, your fuel tank sending unit is bad, and the audio head unit needs cleaning or refurbishing. Take it to someone who knows what they're doing - preferably, the dealership.