99 taurus-wont start

Run tests. Fuel pressure correct? Spark at plugs when cranking? Fuel injector pulse working? Compression test?

before you do anything check you fuel line at the engine and see if you are getting fuel. sounds like its not getting any fuel.

whats the fuel pressure, has the fuel filter ever been changed, good that its getting fire but now it needs something to burn, also check your air filter, make sure its not plugged.

First, verify that there is gas in the vehicle. Next, listen for the pump to energize when you turn the ignition switch to the on position. If you dont hear anything, check the fuel pump relay. Swap it with another one next to it, they are often the same part. If it still doesn't energize, its most likely the pump thats failed. If you hear the pump energize, then the pump pressure needs to be checked. A fuel gauge needs to be connected under the hood on the fuel rail to read system pressure. Verify that its at factory specs. If not, replace the pump.

If it has fuel pressure and fuel to the regulator and the rails, the regulator is working, it is getting spark to every cylinder and the timing is correct, You have good compression, it is likely a faulty sensor. You can test each one with a sensor tester or ohmmeter/multi-tester

Relay or sensor.

check out the injectors and the coil pack to make sure you are getting spark

Check fuel filter.

check the cam and crankshaft sensors

the fuel pump relay is located in a black box called the ccrm , should be beside your battery

check the fuel pump itself.. if no fuel going through lines... injectors won't work.