2003 Audi TT will crank but not start.

I have a 2003 Audi TT Quattro and I am dealing with this problem. The other
day it had trouble starting like it was out of fuel, but I just put some in. Then
the next day it ran fine, day after that it took about 4 sec of cranking to start
but started. Drove to a friends house and when I tried to start it again it
wouldn't. At first I was not getting any fuel, pump wasn't coming on, so I took
it out thinkin it was bad put it to the battery and it worked. Put it back in and it
is now getting fuel to the rail with good pressure but still would not start but I
can hear and feel it come on and the rail is getting fuel. I then had someone
try to replace the crank position sensor and they pulled the three wires out off
the clip that plugs into the sensor. I did the work after that. I replaced the
sensor and still won't start. But when I first reattached the wires back I think I
mixed the wires up. They are black white and brown. I'll post a pic. But can
someone tell me what's goin on? Did I mess the sensor up by wiring it wrong,
or would wiring it back right fix the problem? I need help my car refuses to
start. Cranks all day tho. I heard this is a common problem