That's how injection pump shops operate; flat rate to rebuild one, even if it's only a $5 spring that's broken inside. And usually they only fix what's broken. If you go inside to see what they replaced, then you void your warranty.

Pump shops aren't going to be grinding AFC levers down... Chances are that the new pump is just healthier than the last one, pushing more fuel through the injectors, and that's why you're having smoke problems.

 

begle sounds pretty on on that one. they just told me that itll push about 30-40% more fuel than my stocker did. but i dont know how theyre achieving it. i asked several times and they would not tell me

 

I know why they won't tell you. Its beacause all they did was turn up the fuel screw till it flowed 30% more fuel. They don't want the public to know thats all it takes for increased fuel flow. Kinda like " NEVER MIND THE MAN BEHIND THE CURTAIN " ( i hate that movie )

 

So now you're pushing too much fuel through the system, and you're not getting the increased power that should bring, right? The black smoke indicates overfueling according to something I read on the Exxon website. How does one use that fuel to one's advantage? How does one get it to burn and use all the BTU available? I don't know, but maybe one of you could enlighten me on this. Just curious, as there seems to be so many on the forum that are good diesel mechanics.

 

it takes oxygen for combustion to be possible. in this case the black smoke is comes from incomplete combustion caused by lack of oxygen/excess fuel. we know we need that much fuel to make the power we want so we need to add enough oxygen to burn it all. So... bigger air filter, bigger turbo, bigger intercooler, bigger piping, that sort of stuff.

 

After you run up your your star wheel if you still have pre-boost smoke issues get a boost fooler to run inline with the AFC, that will delay your fuel pin moving. Have you looked for boost leaks?

 

yep...

 

i havent gone into deep testing for them but i dont see right off hand where any could be present. i dont have a sure cap to test it with so i dont know

---AutoMerged DoublePost---

would this much excessive smoke cause the engine to run hot? not overheat but run hotter than normal.

 

Could, shouldn't under normal temps though...

 

i posted a new thread under diesel in distress about my running hot problem.

i backed those out as you said to do though it took me three different tries and test runs but i got it figured out, much less smoke its very nice. not to mention pegged out i only hit about 1175*F WOT as compared to the 1400*F i hit before. now just to figure out why its running hot and ill be set