Problems with the fuel pump usually require professional diagnosis. Possible issues and their solutions include:
* Fuel pump failure: This requires replacing the fuel pump itself.
* Fuel pump relay failure: This is a relatively inexpensive part that can be replaced.
* Wiring issues: A problem with the wiring to the fuel pump can prevent it from working. This may need professional diagnosis and repair.
* Low fuel pressure: This could indicate a faulty fuel pressure regulator or other related component.
* PCM issue: In rare cases, the PCM itself might have a problem.
If your Jeep Liberty isn't starting or running correctly, you should take it to a mechanic or a qualified automotive technician to diagnose the problem. Trying to fix fuel system problems without proper knowledge can be dangerous.
