Check fuel pump relay on firewall passenger side if it has power and power when the key is turned on will click test power through relay to fuel pump disconnect connector at fuel tank make sure you have a good ground test for power at sending unit when key is os or in start if power the sending unit has rotten corroded wire going to fuel pump you will have to remove the fuel tank test power right at the pump if there is no power replace sending unit if power a pump use teslight one end on ground terminal and other lead on power terminal at pump if you have power replace the pump
if this is helpful plz leave a comment like and if you need more help ask once you eliminate pump good luck
Try to take off the fuel line and see if there is any fuel coming out? make shour that you have a good stream that will at least squirt 3 or 4 inches your pump might just be weak! chevy had a bad couple years with there pumps. i had the same problem. and also make shour the electrical plug going to your pump is getting a good connection.
Sounds like a bad fuel pump. note: if your truck is a vortec you will need to be sure to get the correct pump. too little OR to much fuel pressure and the injectors wont work.
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