I can here the fuel pump running but it wont start 1998 chev k1500 4.3v6

Check fuel pressure at the injector rail. Could be your fuel pump relay is cutting out. If fuel pressure is good, check for sparks at the plug wires. Read the link below for more info.
Do It Yourself Diagnosis and Repair

is there any check engine light on?

Check for fuel pressure, 2.5 is Key on engine running
13 PSI (Pounds per Square Inch)

3.3 engine is 40-47 PSI (Pounds per Square Inch) Key on engine off
31-44 PSI (Pounds per Square Inch) Key on engine running

have you check fuel pump fuses and relay when you turn key do you hear pump did you bleed air out of fuel lines after pump replacement is it getting spark to plugs when the car died the first time how did it die were you driveing it was there any check engine lights on

Is the gas tank above 1/2 tank now?

A worn / aged fuel pump will fail when it's hot and the fuel level is low (example: below 1/4)

Park your car in a cool area.

Start the car when it's cold outside,

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Check the engine fuel pump pressure.
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Replace the fuel pump relay,fuel filter,fuel pump and fuel pump stainer at the same time.
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When you turn the key on can you hear the fuel pump??? Does the engine sound normal when turning over(compression)??? Then check for spark, fuel pressure, injector signal etc.

Its called the fuel pump cylinoide which is attached to the fuel pump. Unless the fuel pump is bad, you got an expensive part to buy around $2500 or the cylinoide is $900 whichever is broken. This is a know issue for GMC deisel suburbans 6.5.

Theres only one fuel pump relay, unless you have dual tanks. Be sure you have 55-60 psi fuel pressure. I "think" the oil pressure switch supplies power to the fuel pump after the engine is running.

you'll need a professional computer to reset how ever there are two relays for fuel on chevrolet
i would suggest finding the second one first

The anti thieft system is keeping it from running.