1999 chevy Tahoe wont start but turns over

could be fuel pump or even crank or cam , timing sensor. Did it start running strange before this?

Well the ignition system could, and I guess the ignition switch could too.
Are you getting spark to the plugs ?
Fuel pressure ?
Is it cranking and not starting ?

how about fuel filter

Okay, there is always the possibility he disconnected something. This is not his Tahoe until the Title changes hands, but if you owe money to a 3rd party on this, then the pay off would go to the 3rd party with you holding the bag for any difference. If there is a 3rd party, the Insurance company may be holding the Tahoe for the 3rd party by Immobilizing it as the Insurance company plans to cancel the insurance and pay you money.

There can also be a significant difference in value if this vehicle runs or not. If it was driveable, you could have taken the vehicle somewhere for more estimates. You could also add money to the Insurance claim and pay to get it repaired at your additional cost. Then reinsure it.

At the very least, a Salvage title could be issued for the repaired vehicle after it is fixed up. These laws vary from state to state meaning some states will allow 75% of the value of a vehicle to come from a repair and other states limit to say 50%. That is why there is state to state movement of wrecks to secure a transferable Title. When you get the totaled check, you lose the Title to the Insurance company and must buy the vehicle back from them.

The buzzing sound from the fuelpump is normal to a degree. You should hear something but not excessively. Fuel pressure can be checked at the Tap on the top of the fuelrail.

You can go to Autozone.com and register your Tahoe, then get free chassis Diagrams and pictures of your Fusebox. This may help you find any switches or fuses. Fords have Inertia switches but I beleive GM uses something different.

You can also go to Autotrader or Trucktrader and expand the search for a replacement vehicle. Go to the Kelley bluebook site,(KBB.com) and it will give you values and sometimes tie into vehicles that are for sale. Once you find a vehicle you like, you can see if the insurance company can bargain down the price and secure this replacement for you.

I hope my solution is helpful to you.

In the morning if you turn the key w/o starting it and let it sit a while before starting, does it have trouble starting / smell flooded? If so, likely a bad / leaky injector.

Otherwise, I'd check the O2 sensor(s), likely have a bad one.

hope this helps.

It is not a fuel pump problem.
It a cold start valve problem. It didn't open. There are 2 things to check.
1- The cooling thermal sensor is not sending the proper signal to the ECU to turn on the cold start valve.
2- The bad solenoid inside the cold start valve causing it not operational.
Case 1 you can easily replace the thermal sensor.
Case 2 checking this requires professional skill to confirm if there is a signal at the valve during the start.
Good luck

check fuel pressure. If its marginal then replace the pump. These trucks are touchy on fuel pressure. Just a couple psi low and they do exactly this. In the morning cold is when you need max fuel. Be sure to replace the harness also as these tend to lead to repeated pump failures when faulty, which is pretty common

i have a 99 5.7 chevy suburban and have to use starting fluid for it to turn on , ive replaced the fuel reg. and fuel pump is 4years old fuel filter 6months old new cam and crank sensor new distrbutor rotor and cap

I'm assuming that by turning over, you mean that the engine fails to turn with the starter . Check your battery for 12v and make sure all connections are clean and secure. If battery has less than 12v charge it and check the charging system after re-starting. Lights and radio do not pull the same amperage as the starter and may not tell you much about battery condition. If you have full battery voltage, check the starter for 12v at the battery connection and the small (trigger wire) for 12v with the key turned to start position. If you have both, likely starter has failed.

your fuel injection system isn't holding residual pressure.  The valve in the fuel pump that holds the pressure is defective.