2005 Astro van- on occasions, when I put the key in the ignition, the gas gauge stays on empty, the dash reads low fuel (this has happened with a full and half filled tank) and the check engine light is on. The van cranks well but it seems like it is not getting gas. This does not happen all the time.

SOURCE: GMC envoy after I filled gas tank the low fuel

You will need to replace the fuel level sensor which is in the fuel tank.They have a lot of problems because the metal fingers on the sensor wear off and gives you the incorrect readings.This will also cause the check engine light to come on.You will probably have a level sensor code.This will be a lot easier if the fuel level is down to about a quarter tank or less.Also you should be able to get just the level sensor and not have to get the complete fuel pump module.Good luck.

SOURCE: 2002 Chevy Suburban: Fuel gauge reads empty, tank is half full

Youre gauge is controlled by a plunger in the fuel tank which is attached to the sensor and the fuel gauge. it sounds like when the plunger goes down half way its either getting stuck down lower then it should. Needs replacing. Any mechanic can do this install for you.

SOURCE: gas gauge malfunction and engine light stays on

This is a common problem with Malibu's. It is due to cheap metal in the fuel gage that corrodes. Chevrolet knows about this but they refuse to issue a fix. The check engine light staying on and the faulty fuel gage are related. This is a defect and they need to recall this part! Raise hell with the dealership!

SOURCE: 2005 kia sorento Fuel Gauge says empty with 1/2 tank of gas.

Fuel sensor is not working well. Just changed mine today for the same problem.

SOURCE: i have a 2001 chevrolet suburban the gas gauge

The problem lies in the sending unit in the tank. It could have a wiring problem or the sending unit is bad.