Auto Parts: 96 Jeep not getting fire, crankshaft sensor, crank sensor

Question
My jeep is not getting fire. He is what happened, I was on vacation and I went to start my jeep and get gas to start a new work week. I found out that some one stole some gas and the gas gage will not register any gas. We call someone over they said we would have to drop the tank and replace the pump, we did that. But the jeep will still not start. It will start to start but it will not turn over. One person said it was the crankshaft sensor and someone else says the oxygen sensor. We tried to manually code test I get code 51 but I'm not sure what that is?
Please help.

Answer
Hi Rebekah,

I would assume a code 51 would be present on an engine with no-start because it is a lean O2 sensor code. If your engine is turning over, getting fuel but no spark, you should test the ignition controller and the crank sensor. Why it would have gone out at that time may just be a coincidence.

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Thanks for the question, I hope this information was helpful to you.
Fred
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