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Old 08-02-2008, 05:53 PM   #1 (permalink)
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Smoke Screw

I have been backing out the smoke screw on the top of my injector pump. It is located under a brass cap on top of the pump. So far I have backed it out 1 1/4 turns. My fuel milage went from 22 mpg to 26.5 mpg. I am afraid of going to far and ruining something. Does anyone know anything about this.
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Old 08-02-2008, 05:56 PM   #2 (permalink)
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what kind of truck?
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Old 08-02-2008, 07:09 PM   #3 (permalink)
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1991 dodge standard cab, cummins, 5 speed, 2 weel drive
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Old 08-02-2008, 08:53 PM   #4 (permalink)
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You won't hurt anything unless it falls out. If it does that, just put it back in. That screw preloads the fuel cone that is pushed down by the boost pressure. More boost = more fuel.
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Old 08-02-2008, 11:42 PM   #5 (permalink)
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does this work the same on newer generations?
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Old 08-02-2008, 11:54 PM   #6 (permalink)
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yea want to know more on this one to and would it work on mine
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Old 08-03-2008, 02:23 AM   #7 (permalink)
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The smoke screw is an adjustment on the bosh ve injection pump in first gen rams, so, no it won't work on newer trucks. Sorry. Jim2, if you turn your star wheel up it could also help you gain mileage. It would make your truck kinda doggy until the turbo spools though.
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Old 08-03-2008, 11:24 AM   #8 (permalink)
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Thanks for the info. I will keep playing with it and keep you posted.
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Old 08-13-2008, 07:31 AM   #9 (permalink)
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I just backed the smoke screw out another 1/2 turn, then I took the cover off the top of the pump to adjust the star wheel. Now it looks like I've got the smoke screw out as far as it's worth going. The diaphram can hit the top of the housing. I turned the star wheel 1/4 turn CCW. I'll write back in about a week to let you know what my milage is. It also looks like I might be able to turn that off-set cone in the bottom to help.
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Old 08-13-2008, 08:04 PM   #10 (permalink)
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you're 100% right about being able to turn the fuel pin. Just put it so the shallowest part of the cone is facing the front of the truck.
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Old 08-23-2008, 07:25 AM   #11 (permalink)
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I just filled up last night, and checked my milage. With the smoke screw backed out all the way, the shallow side of the cone facing the front of the engine, the starwheel turned 1/2 turn CCW, and conservative driving I got 28.3 MPG! Now I think I'll start playing with the full fuel srew.
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Old 08-23-2008, 10:34 AM   #12 (permalink)
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Quote:
Originally Posted by Jim2 View Post
I just filled up last night, and checked my milage. With the smoke screw backed out all the way, the shallow side of the cone facing the front of the engine, the starwheel turned 1/2 turn CCW, and conservative driving I got 28.3 MPG! Now I think I'll start playing with the full fuel srew.
Well - there goes the conservative driving
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