Help! Mustang wont start!

[RPM427]

When you go to crank the car over, does the "check engine" light come on for a few secs? If so, that means the EEC is alive and you haven't blown the power relay or fuse. If it doesn't come on, either your computer is fried or you will need to replace a relay or fuse.

You should check the fuel pressure from the shrader valve on the fuel rail, near the alternator. That will rule out any regulator problems.

Todays mechanics are used to hooking up a piece of diagnostics equipment to a newer car and having the computer tell them exactly what is wrong with the car and how to fix it. If you hook up a scanner to your computer, it will tell you if a sensor is bad, and also allow a decent mechanic to figure out exactly what is wrong with your car. Did you go around the car and check that all your grounds are still intact or a sensor hasn't come unplugged? It may be something as simple as that.

Good luck.