My 2006 silverado wont start

What fault codes do you have?

check the crank sensor that seems to cause intermittent starting stupidness. had that problem on my silverado.

if you know there is gas in it sounds like fuel sending unit in tank

try a little starting fluid if it starts you need a fuel pump

my truck has a 4.9 engine 90 model f150 pickup it just stoped fuel pump is working and got fire it will turn over but wont start why

It might be the fuel pump, you can test it by pulling off a vacuum line on the intake manifold, then spray a lot of carburetor cleaner into the manifold, then replace the vacuum line and see if the engine will start. If the engine does start and run even for a few seconds, then you have a fuel related problem and it will most likely be the fuel pump itself. (make sure that the carburetor spray that you use says that it is extremely flammable, otherwise it will not start the engine).

check fuses and relays then connection under seat for power may also be loose or disconnected

If the starter doesn't turn over the battery is dead or you need to replace the starter.

The gas gage not working is caused by the fuel level sender located in the fuel tank this will also need to be replaced.

then your fuel filter is clogged or your gas guage is broken and she's bone dry

Might be bad gas or it sounds like your fuel pump is out. It doesn't cost very much but I think it is located in the tank itself. Drain the tank and discard the old gas. take down the tank and replace the pump. This should fix your problem.