2000 5.3 silverado won't start. Fuel pump used to make noise when key turned on. Now nothing

spray gasoline or carb cleaner into intake. If engine starts, it's a fuel problem. You have a bad (new) fuel pump or relay. Either no power to pump or pump is bad (unlikely but possible).

Check your fuel pressure it should be 60-66 psi with the key on and engine off.Sound like you might have a weak fuel pump.

Your pump is controlled by the pcm using a 12 volt signal to the relay. Pull out the relay and probe the relay socket with a voltmeter. There should be 2 terminals with 12 volts when the key is on. With the key off, there should be one 12 volt terminal coming from the ecm b fuse. See top left of diagram below.

remove gas cap put ear close to filler tube and have someone turn on key listen for pump to turn on it will be a buzzing noise if you hear this then try replacing the fuel filter if there is no noise check the fuel pump fuse if the fuse is ok then replace the fuel pump

im going to say the starter is shot

Your problem may be one of the following:
First check or just replace the fuel filter. Usually located under the car in front of the rear axle, drivers side.
Next, the fuel pump may be worn out. Usually they get loud or stop working (running).
Next, check the fuel pressure regulator. Usually located on the front fuel rail, drivers side.
Is the vacuum line attached? Not leaking or rotted?
Also, do you smell a strong fuel odor when it won't start? May be one or more stuck-open injectors, or the coil pack is bad.
Checking these in the order listed will more than likely fix your problem.
The clicking noise indicates the battery can no longer run the starter, which also means the fuel pump won't run either.
It could be a fuel issue. How old is the fuel filter? Can you hear the pump run for a few seconds when you turn the key on? Try turning the key to ON without trying to start engine three times waiting for the pump to stop running each time. Then try to start the engine. If it starts, Its a form of Vapor lock caused by the extreme heat we have had lately, and a weak fuel pump.

If none of this works, try a new fuel filter first. From there have someone check the fuel pressure regulator and then the pump. If you are in need of a new pump, take my word for it and spend the money to get one from a Dealer, and not from your favorite parts store. Most parts store parts are made in China and they are JUNK.

can you hear the fuel pump make a buzzing sound for 1 to 2 seconds when you turn the key to the on position? if yes, try changing the filter. if not check the fuses and fuelpump relay under the hood. if good, replace the pump

could be a bad fuel pump...when you first turn on the key in the mornings in a quiet setting you should be able to hear a humming noise coming from your fuel tank it might only last 4 to 5 seconds this is the prime for the fuel rail going to injectors..if you dont hear this, i would take it to a shop to confirm. usually on most cars there is a dedicated fuel prime wire that you can hook up twelve volts to confirm that the pump is working, if the pump is working then it will be a lot easier fix.. because it might only be a fuse or relay that is causing the problem.

one good way to check that the fuel pump is running to listen. take the gas cap of and put you ear the the fuel tank fill neck. have a freind turn the key from the off position to the on position, but do not start the crank the engine over. you should hear a huming or wizzing sound for a few short moments. if you hear that sound the pump is running and more thatn likely pumping fuel.

Fuel pump