I just installed a 4.5 RC long arm kit on my 97 xj sport and it will not start after I lowered it back to the ground. The battery ran dead because i left the hood up with the light on while I was working on the project, I then charged the battery and it cranks but doesn't start. It doesn't get spark and fuel doesn't come out of the fuel rail while cranking. Moved starter relay around and didn't help at all, All the fuses are good. Cant figure it out.

 

Have you checked all your grounds? Make sure nothing was jarred loose int he install. Some vehicles will only turn over but not crank if grounds are not secured properly.

Just an idea to try.

 

checked them too, couldn't see any loose or disconnected wires.