g-20 won't start

Checked fuel pump & lines have preasure checked electrical have current to and from starter ,turn key over all the bells and chimes go on but nothing happens when turn key over to start.could it be saftey nuetral ? checked fuses all are fine.

Welcome to AF
What year and engine?
Does head lights and horn and heater blower motor work good.
Good battery and battery cables clean and tight?
Some have a starter relay.
Have you checked both fuse boxes for good 12 volts to all fuses?

I would also advise pulling the engine cover; then pulling off a sparkplug wire and checking for actual spark when you crank the engine over. I do it by putting a 'test' spark plug into the end of the loose plug wire. My test spark plug has the side electrode pried up so the spark has to jump at least 1/4".
It could be a bad neutral safety switch, or where the linkage has worn so its out of adjustment. On my 87 G20 with the automatic tranny that switch lives outside & underneath, and is subject to lots of salt/slush spray in the winters.
To pull the engine cover: I always remove the passenger seat, then the console cover, finally the engine cover. After doing it a couple of times it gets to be easy. And that way you will be able to reach the rear most spark plugs easily.
When I bought my 87 G20 I began looking for replacement electronics and sensors for all things related to the engine running. I got most of them from ebay, some from salvage yards, and they were cheap. I swapped them with the originals one at a time to make sure they worked, and now I carry them in the van everywhere, along with my tools.

First guess would be a bad starter solenoid.