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Message: <blockquote data-quote="chris" data-source="post: 2161980" data-attributes="member: 208377"><p>On this engine i would check my fuel pressure first and make sure it's in spec.  Black smoke and poor fuel economy is for sure caused by the truck over fueling.  4.3 is well know for leaking fuel pressure regulator, this is located under the intake manifold.  They cost about $1000 bucks for the part.  If you suspect the fuel pressure regulator and your fuel pressure is on spec then clamp off the fuel return line and get someone to cylce the key to build pressure, now also clamp the fuel inlet line so that both the fuel return and pressure line are pinched off.  If  you see the fuel pressure drop withing 5min then you most likely have a leak in the fuel pressure regulator. A shop would have charged you $100 for this information.  Good Luck</p></blockquote><p></p>