Fuel injector on GM350

my mother just purchased a used 2001 olds silhouette van 70k miles on it. i was just wondering if anyone has had any experience with this vehicle. she brought it home tonight and already the gas gauge is acting up. it was idling and the gas gauge dropped down almost to e and the low fuel light came on, which i expect this is how this is supposed to work? when the gas needle drops so far that gives the indication for the low fuel light or does that signal come from the sending unit in the gas tank? anyways, when this happened there was approximately a 1/2 tank gas in it. i took it and filled it the rest of the way up and so far the gauge has stayed. could this be an indication the fuel sending unit is on its last leg? does anyone know of any problems with this type of vehicle or do they have a pretty good reputation? any input will be appreciated, thank you

I own a 04 Trailblazer ls, today my abs and parking brake dummy lites came on. Why would both come on at the same time? Anyone else had a problem like this?