I have a 97 Jeep Grand Cherokee that is turning over, but won't start up. Any suggestions?

It has a full tank of gas and new battery and terminals. Just had the fuel pump replaced and drove it home from the shop fine, no problems...next morning wouldn't start.

I need to post a "How to Diagnose a No-Start" chart somewhere on the Internet....:-P...

If your car is turning over but not starting, one of three things is wrong:

1) You are not getting spark (most common)
2) You are not getting fuel (less common)
3) You are not getting airflow/compression (rare)

The fact that you just had the fuel pump replaced naturally raises suspicions about the fuel system.

It is possible that...

--The new fuel pump is faulty.
--The fuel pump is fine (and the old one was fine), but it is not receiving power (due to a bad relay or engine computer problem)
--The mechanic installed the fuel pump improperly (e.g. left a connection loose).

There is one simple thing you can do if you have a bad fuel pump. Locate the fuel tank and get a blunt object (like a hammer, baseball bat, 2x4, etc.). Have an assistant attempt to start the car (turn the key so the engine turns over) while you TAP repeatedly on the bottom of the fuel tank. This tapping sometimes will get a faulty fuel pump to start working.

If that doesn't work, then you should tow the car back to the mechanic who changed the fuel pump and demand that they get the car running again.

Good luck.

is it low on gas? bad connections?

I might add that the battery is new along with the terminals. No clicking when I turn it over, just won't fire and start...just had the fuel pump replaced, drove it home from the shop and the next morning it wouldn't start.