Fuel Pump I am changing out the fuel pump on my 1999 Chevrolet Tahoe. I need some instructions on the best way to install my new fuel pump.

If the battery is dying that quickly you need a new battery
On the Tahoe K series 5.7L the fuel pump relay is in the engine compartment to the rear of the engine control module, should be identified on the cover over the relays
https://fuse-box.info/chevrolet/chevrolet-tahoe-1995-1999-fuses-and-relay

https://scanneranswers.com/signs-of-a-bad-fuel-pump-relay/
https://easyautodiagnostics.com/gm/4.3L-5.0L-5.7L/testing-the-fuel-pump-relay-1

Is the check engine light coming on right before it dies? Is it dying at a stop when in idle or at speed?

Your best bet is to get a fuel pressure gauge and see if you have the required pressure at the test port.

Could be the pressure regulator on the fuel rail. Pull the vacuum line off the regulator and check it for fuel contamination. There should not be gas in the line. If there is fuel in that line the regulator is bad and needs replaced.

NEED TO CK HOW MANY AMPS THE FUEL PUMP CONSUM AND SEE IF THE PROBLEM HAPPENS WHEN THE TANK IS LOW IN FUEL YOU MY NEED A NEW FUEL PUMP

the labor time is 2.1 hours,but that does not include the drain and refill, hope this helps. information from ALLDATA 10.10. Please rate my fix as i strive to be the best, if you need more help get back to me

It may be just a louder pump if not purchased from GM, but keep your receipt handy just in case. Provided it was installed correctly, with proper gasket/"O" ring in place, and vehicle is running as it should.

HERE IS THE PART NUMBER, YOU WILL ALSO NEED A NEW FUEL PUMP CONNECTOR, THEY ARE ONE OF THE PROBLEMS THAT ONTRIBUTE TO THE FUEL PUMP FAILURE.
DELPHI Part # FG0089 {MODULAR FUEL PUMP ASSEMBLY} $174.79

If it is not a fuel problem, then it has to be either not enough air or an electrical starting problem. Try starting it without the air filter in place. It could also be a bad plug or more likely a bad spark plug or coil wire.

We've been having the same problem with our 1999 Tahoe. We were also told either fuel pump, fuel regulator, or injector. We believe it is the fuel injectors, particularly since reading this:

http://www.arb.ca.gov/newsrel/nr021103.htm