engine turns over but won't start

What is your question?

My girlfriend was driving her jeep when all of a sudden the engine died. Now the engine turns over fine but no sign of it starting. Heard about replacing crank sensor but it's 70 dollars and didn't want to spend the money if theres something else i can try. Also a day before this happened she filled up with gas and never put the cap back on. Thought air might of gotten in fuel line but very unlikely seeing how it was full of gas. I checked bleeder valve on fuel injection rail and after bleeding and cranking always spits out fuel.