I just replaced the fuel pressure regulator and now I am hearing a vibrating noise from the fuel line under the truck. What do you think the problem is.
If your hearing a vibrating noise from the fuel line under the truck or it sounds like it is coming from the fuel tank, try replacing the fuel pressure regulator. If you did already replaced the regulator and you are herring that vibration, that is because you did not replace the regulator with a genuine GM regulator, not some after market brand. Trust me, I made that mistake and replaced a fuel pump for nothing. the new pump made the same noise. Then I replaced the regulator with a GM regulator and the noise stopped.
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The fuel pressure regulator is mounted on the spider injection assembly which is under the intake manifold. 
It's the bronze can looking thing on the right of the rectangle.
As far as your hard start while sitting for extended periods,
perhaps the injectors are leaking, flooding the cylinders.
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I should have said it is under the upper intake manifold. The whole intake doesn't have to come off, just the top part.
You will need a new upper intake gasket and a torque wrench would be help full but not absolutely necessary. The bolts don't need much torque so just don't go crazy when tightening them. The upper intake isn't too hard, will probably take you a few hours. The hardest part will be removing the fuel lines. You will need to disconnect them from the intake and from the the hard lines at the back of the intake as well to remove it. I'm not sure if removing the injectors will be necessary to replace the regulator but if it, is be careful. The plastic injector tubes can get brittle after time and break. Also be sure to put the injectors back in the right ports.
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Hey man having the same problem with mine did u fix the problem and what was it.
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How hard is it to remove the upper manifold on a chevy silverado 4.3 to replace the fuel regulator? its 20 degrees outside and I have no garadge? do I need gaskets and a torqe rench? should i replace the injectors as well? Thank you very much for the photo! I was looking for a fuel rail, not to be found.
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