99 cavalier cranks from starter but wont stay on ,new fuel pump

Cool beans

was the fuel filter changed too?

This is a very common problem on GM vehicles. The security system is notoriously known to fail. Basically when you insert your key, the system checks for a certain signal. If the system cannot get the correct signal from the key, it assumes the key is incorrect or you are attempting to hotwire it. The system then goes into SECURITY lockout mode. (prevents vehicle theft) This will either turn off the starter, or the fuel injectors. This has been happening with GM's for a very long time. There are ways to bypass this now. Read through these pages for info, solutions as well. Google these for info diy-gm-security & newrockies