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Need help. Have 02. Check engine light comes on and off. Loss of power, black smoke whether driving empty or hauling. Anyone have an idea? Fuel pump in tank? Fuel pressure regulating valve? Fuel pressure regulator?
 

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:welcome to the forum!!

I would get the codes read...that would point you in the right direction...could be a boost leak....any programmer on your truck?
 

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change the fuel filter and see what happens....

what year truck you have? Normally with the LB7s (at least in my experience) when you get the overboost code it just trips the light and you dont lose power...but I know there are some that do lose power.
 

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0...there is no pump in the tank...the CP3 pulls fuel from the tank..the fuel system is under a vacuum until after the CP3 (injector pump)

When is the last time the fuel filter was changed?
 

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Sounds like a boost leak also. Check the hose before your intercooler
 
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