This is a common problem with vz800 models, I had the very same problem front ran lean and rear ran rich. I would advice you to do the following strong. change the frot jet to 130 rear to 135 and both needles should be 3rd from the top. it's not your fuel pump it rarely goes bad.If there is back firing then turn the carb. screw out by 31/2 turns. hope this helps. PS: it is not your petcock, nor your fuel pump. One advice have you gas tank cleaned and line it with POR only it is a good product.
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