2004 ss siverado 6.0. engine does no crank

You say 'won't turn over'. Do you means the engine is not cranking (turning over), or do you mean it cranks but doesn't 'start'? Did you disconnect the battery when you installed the fuel pump.

The flashing anti-theft light may be a clue here.

1. Insert the key into the driver's side door lock.
2. Turn the key once, but not all the way to unlock the door. Leave the key in this position for 40-60 seconds. ...
3. Do this again, but turn the key in the opposite direction.
4. Remove the key from the door, get into your Ford, and start the engine. The system should be reset.

How to Reset the Anti-Theft System on Your Ford

Or there are videos. You should also check for DTCs, diagnostic trouble codes.

https://www.google.com/search?q=2004+ford+mustang+reset+security+system

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When you turn the key to the start position what happens ? Does the starter engage an spin the engine ? A crank - no - start or nothing happens - No -crank - no start ? Need a better info. .

The low oil pressure light will come till the vehicle starts an runs ! Explain wants to turn over but won't ? The engine spins over when you turn the key to the start position but won't start an run ? Or when you turn the key to the start position an nothing happens ? If the first one engine spins over but won't start an run , What's missing ? Spark , Fuel pressure , Compression ? Videos on youtube for cranks no start , how to trouble shoot !

6 Common Reasons Your Car Won't Start ' General ...

www.genautoinc.com/6-common-reasons-your-car-wont-start.php

Jun 25, 2015 - If no dashboard lights come on when you turn the key in the ignition, that's a ... You can also check whether your windshield wipers, radio, heat/AC or headlights work. ... If your car can't pump the gas to fuel the engine, it won't start. ...the starter works and the fuel gets to the engine, but still nothing happens.

Three Reasons Why Your Car May Not Start

www.dirtcheapquotes.com/Mechanical/why_car_wont_start.htm

Your online resource for auto, truck or motorcycle insurance. ... Starting Problem # 1: Engine Won't Crank At All. Scenario: You turn the key, but nothing happens: And by nothing, we mean there ... Jump-starting the battery should get the engine to start. ... Incars with electronic fuel injection, you should hear a light hum a few ...

Car Won't Start ' The Family Handyman

www.familyhandyman.com > Skills

If you turn the car key and your car won't start, don't give up. Before you call for a tow, try these seven simple tricks to get your car started again. The only tool ... To heat up the battery, terminals and starter, try the "key cycling" trick (photo 1). But if the domelight stayed bright when you turned the key, move on to the next trick.

How to Diagnose Problems If Your Car Won't Start - For ...

you failed to say, does crank, when it don't start?
and btw, the fuel pump on most cars only run cranking or running
some run for 3 seconds, key on, but you'd miss that fact. using
only one person.
the key word here is crank, does it crank as full speed, via the cranking starter motor. that is the engine cranks spins fast.
on this car it will spin min 250 RPM, cranking, and uses large
battery current , so on diesels it takes a very strong battery to start
and working glow plugs.

bad fuel pump relay. when you first turn the key to the run position , not cranking the engine, if you listen close you should be able to here the fuel pump run for a few seconds. if you can't here it you need to replace the fuel pump relay in the under hood fuse box.

If the engine will not crank and you know the battery is good, a mechanic would check for voltage at the starter, the neutral safety switch, and the key switch.
If the security light stays on, you have a problem with the passkey system.
A fuel pump problem will not prevent the engine from cranking.

turn the key to on position but don't crank engine , leave on until security light goes off, 10-15 min and then crank starter

It could be a number of different things. Has it been worked on recently, or is the check engine light on? I would be happy to further assist you but there are too many options to what it could be.

You need air, fuel, and spark for your engine to run. Did the car do anything strange before not starting? Does it crank and turn over? If so, you should check you are getting fuel. Check the fuel pump relay and fuel pump.