96 jeep cherookee sport question

[littlesopho]

I have a 96 Jeep that wouldn't start without push on the gas slightly while turning the key But now it wont start at all I replaced the internal fuel pump and fuel filters What else could be wrong? There is also spark getting to the engine.The only engine codes that poped up where 12 and 55. It acts like it wants to start but just humbs when you turn it over. If someone could answer this I would be so greatful.

[Dale Aeppli]

When you turn the key on can you hear the fuel pump run it should run for 3-5 seconds the turn off. Try spraying some throttle body cleaner into throttle body and starting it. if it starts you have a fuel delivery problem . Did you use new hoses when you installed fuel pump? [email protected]