Help!!!!! 2000 gmc jimmy

[darush01]

I have a 2000 gmc jimmy 2 dr 2wd 4.3 vortec, i have put 3 fuel pumps on it it has a new fuel filter new crank sensor newish mass airflow sensor i have run out of ideas when i put a new fuel pump on itll take a few tries but itll kick in and run drive like a champ then itll start jumping and acting crazy trying to die out itll run good again the eventually the fuel pump will just stop kicking in all together. At one point it was pulling an evap code but as of now i dont know what its doing i just need it fixed im young but these new vehicles stump me pretty easily when it dies its because its not getting fuel and if its due to a bad pump what coild cause it to burn up so quickly?
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