Could be the fuel pump. Check for fuel pressure by turning the key to the run position, but don't start it. Next go to the fuel rail (in engine compartment) find the Schrader valve, depress valve and see if fuel squirts out. If not, its possible that your fuel pump needs to be replaced.
Check the easy stuff first. If there is spark at the plugs next try getting it some fuel. If you use a hypo needle with some gas in it you can inject it into the intake. If it shows encouragement and fires then check if there is fuel pressure. If none check the electrical to the fuel pump. If there is power to the fuel pump then remove the fuel pump and apply power directly to see if it works. Good luck.
SOURCE: 2003 3.7 Liberty check engine light for crank sensor
2003 3.7 Liberty check engine light for crank....what? sensor? You have scanned it?
SOURCE: my check engine light does not flash when i turn key before start
bulb is probably blown... you have to remove the instrument cluster to change the bulb
SOURCE: 2005 jeep liberty brake lights will not work. I
brake pedal switch, get a wire, unplug plug, bridge circuit and check lights.
plug and switch is high up on the brake pedal not normally easy to get to.
SOURCE: 2005 Jeep Grand Cherokee Limited, 5.7L V8, starter
Every morning at lunch time and evening my jeep won't start. It doesn't grind but the electrical goes crazy. After a couple of trys it finally starts. Help
SOURCE: 1995 Jeep Wrangler 2.5L Fuel Pump/Check engine light
Could be one of several items...I'd check the fuel pump relay, auto shutdown relay and the ignition switch itself. I'd bet on it being one of those relays but, we all have been fooled at least once!!! I'd also make sure that body and engine grounding is good and clean. Relays can't work properly without a good ground.
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