Jocko Posted June 11, 2012 Share Posted June 11, 2012 hey guys i have a 350 big cam cummins with a cummins pt fuel system. i was wondering how to turn the pump up so i can have more fuel going to the engine.thanks Quote Link to comment https://www.bigmacktrucks.com/topic/25604-more-fuel/ Share on other sites More sharing options...
fifth wheel Posted June 11, 2012 Share Posted June 11, 2012 Why?FW Quote Link to comment https://www.bigmacktrucks.com/topic/25604-more-fuel/#findComment-123432 Share on other sites More sharing options...
tkobes43 Posted June 11, 2012 Share Posted June 11, 2012 He wants SMOKE! Kinda pointless, waste of fuel, but looks cool. Just make sure its not obnoxious. Like a nice puff when its working hard. Not like those fricken cummins pickups when they roll coal doing 90 on a highway. thats dumb. Tom Quote "Nothing Breaks Wind Like A Bulldog" Link to comment https://www.bigmacktrucks.com/topic/25604-more-fuel/#findComment-123439 Share on other sites More sharing options...
gvam Posted June 11, 2012 Share Posted June 11, 2012 I tried to tell a guy who had one of those "bug foggers" that all that black smoke is the your fuel mileage going down the tube. Quote Link to comment https://www.bigmacktrucks.com/topic/25604-more-fuel/#findComment-123446 Share on other sites More sharing options...
b61mack Posted June 11, 2012 Share Posted June 11, 2012 hey guys i have a 350 big cam cummins with a cummins pt fuel system. i was wondering how to turn the pump up so i can have more fuel going to the engine.thanks Its not as easy as turning a screw, there is a button under a cover at the bottom of the fuel pump that has numbers, there are shims in there too for the max RPM. i think the lower the number the more fuel, and in the throttle shaft there are shims you can add to increase fuel pressure. you would be better off to leave it alone in my opinion. Ron Quote Link to comment https://www.bigmacktrucks.com/topic/25604-more-fuel/#findComment-123475 Share on other sites More sharing options...
theakerstwo Posted June 12, 2012 Share Posted June 12, 2012 He wants SMOKE! Kinda pointless, waste of fuel, but looks cool. Just make sure its not obnoxious. Like a nice puff when its working hard. Not like those fricken cummins pickups when they roll coal doing 90 on a highway. thats dumb.Tom No that stupid and dumb. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/25604-more-fuel/#findComment-123486 Share on other sites More sharing options...
Jocko Posted June 12, 2012 Author Share Posted June 12, 2012 yeah i just want a little puff when im working. because right now its all the way down and nothin comes out Quote Link to comment https://www.bigmacktrucks.com/topic/25604-more-fuel/#findComment-123511 Share on other sites More sharing options...
b61mack Posted June 12, 2012 Share Posted June 12, 2012 No that stupid and dumb. Theakerstwo does a cummins have a thing like a puff limiter on a Mack, it seems i saw a little 1/4" line coming from the intake manifold on a 78 350 big cam. Ron Quote Link to comment https://www.bigmacktrucks.com/topic/25604-more-fuel/#findComment-123524 Share on other sites More sharing options...
theakerstwo Posted June 15, 2012 Share Posted June 15, 2012 Theakerstwo does a cummins have a thing like a puff limiter on a Mack, it seems i saw a little 1/4" line coming from the intake manifold on a 78 350 big cam. Ron Yes it does. Its call a AFC Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/25604-more-fuel/#findComment-124120 Share on other sites More sharing options...
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