i have a 1990 camaro rs and the battery drained and now the anti theft is enabled the car cranks but the fuel pump doesnt turn on.can someone help me with this?

There is a chip in the key which must match a specific resistance with the antitheft module. If it matches, then the antitheft module supplies ground to the starter enabler relay. If the key doesnt match, then you must wait 3 minutes to try again. Your problem is not vats related. I would start with the fuel pump relay and use the red test circuit on it(jumper to 12v). Listen if it primes.

I had this happen to me check the power wires going to the pcm. I had one that was damaged.

If it was VATS your car wouldn't crank at all. Check the fuel pump relay and also the fuse next to the battery.