Car quit running suddenly, now will turn over but will not start.

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Put on new head, water pump, and timing belt. The engine was running better than it has since we bought it. About a month later my wife was on the way to work when suddenly the motor just quit. Towed it home. Now it will turn over and sometimes sound like a cylinder might try to fire, but nothing close to cranking. How to proceed from here. It has fuel pressure at the rail but the code is 1167 indicating fuel sending unit is a problem. The gauge is definitely erratic. Can this cause the problem?