Replaced the fuel pump in 1999 grand prix but after putting gas in it

Oh no ! you ran outta gas and it sat with an empty tank !

OR, its been sitting since Bush was prez.

But first,,, did you see the old pump that was removed ? Was it shiny and clean ?

Did the rubber parts appear to be nasty, melted, or rotted ?

What happens with our modern alcohol-gasoline is that it absorbs water and melts rubber.

Both of which is fatal to a old gas tank.

Is this a D.I.Y. problem ? You must remove the gas line near the engine and test the fuel pump pressure.

Without the proper pressure, the computer is no-go.

A shade-tree mechanic would squirt some gas into the air intake to see it would fire.

I do not recommend you trying any shortcuts like that. The keyword is fire !

Oops, I jumped pass the 'before I buy it'.

No, not until it can pass your state's emissions test. You could be looking at a $500+ problem.