Lightweight Pulleys - Page 9 - Dodge Cummins Diesel Forum
3rd Gen. Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect...NO ADVERTISING

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post #97 of 121 (permalink) Old 11-13-2019, 10:58 AM Thread Starter
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Wow, that sucks... i am lucky I accidentialy found what fixed mine (2nd one)... still gives me some pain but its like a 1~2 on a 10 scale, next to nothing.


thank you for your service!


edit: New belt for EWP...
https://www.rockauto.com/en/moreinfo...49517&jsn=2071

The above belt was listed in the install instructions that came with the pump, it proved to be too long & there was too much slack. Went with this belt and fits awesome. Tight with little slack (my expectation)

Gates p/n K081102HD

https://www.rockauto.com/en/moreinfo...78980&jsn=2595


AFE PG7 drop in filter, AFE Torque Tube, HTT 2.5 turbo, AFE e-mani, ATS Arc Flo, 50HP DDP , 428k, HPTuners, G56, 25.065 mpg, mpg threads ->https://www.cumminsforum.com/forum/3...l#post23312562
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post #98 of 121 (permalink) Old 11-13-2019, 08:30 PM
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Settled on a 2012 pump I will need to change one of the hydro boost lines to make it plug and play. Hopefully it's a better pump than the 2008 even, since it's made by Toyoda, and we all know Doge has been trying to get a handle on it's steering for a long time now I figured the newer the better on this part.

Edit; hydro boost hose PN; 6808 0207AD
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03 QCLB- 19 to 25 mpg with electric parts, and engine mods....

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post #99 of 121 (permalink) Old 11-25-2019, 06:01 PM
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I broke this pump in on the bench with an air tool hooked up to it, and just let it run for awhile with no load on it. I installed it and to check for belt slip I poured some ATF on it and there was no chirp or squeal so, I cleaned it all off with breakleen and ran it. I went for a MPG run to see if it helped, and I got some crazy number of 36 mpg so I need to do that again and use the same pump I guess?

03 QCLB- 19 to 25 mpg with electric parts, and engine mods....
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post #100 of 121 (permalink) Old 11-26-2019, 10:10 AM Thread Starter
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36 is hard to believe... if your tanks not vented, fill it all the way to the fill tube and do your mpg run, then refill to the same spot in the neck.

Post up a pic of the receipt when your done.

I'm seeing maybe a 1~1.5 mpg bump from the EWP change on this current tank, cold weather, cold intake temps (60's) and having a hard time getting CTs up to 200 because of the open front end. Just past 200 miles last night and plan to fill at approx 300...

AFE PG7 drop in filter, AFE Torque Tube, HTT 2.5 turbo, AFE e-mani, ATS Arc Flo, 50HP DDP , 428k, HPTuners, G56, 25.065 mpg, mpg threads ->https://www.cumminsforum.com/forum/3...l#post23312562
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post #101 of 121 (permalink) Old 11-26-2019, 12:12 PM
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Originally Posted by steve05ram360 View Post
36 is hard to believe... if your tanks not vented, fill it all the way to the fill tube and do your mpg run, then refill to the same spot in the neck.

Post up a pic of the receipt when your done.

I'm seeing maybe a 1~1.5 mpg bump from the EWP change on this current tank, cold weather, cold intake temps (60's) and having a hard time getting CTs up to 200 because of the open front end. Just past 200 miles last night and plan to fill at approx 300...
Yeah it's not correct, I drove 12 more miles after I topped it off and it took another 1.17 gallons from another pump, but that also tells me I did over 20 mpg easily, but 30+ no way. I couldn't even get the coolant temp over 170 deg.

03 QCLB- 19 to 25 mpg with electric parts, and engine mods....
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post #102 of 121 (permalink) Old 11-26-2019, 03:43 PM
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Well, I don't know what to say. I did my usual route paying very careful to keep it between 60 to 65 mph and 1500 rpm, because @ 70 mph it takes 1700 rpm, and 6 lbs of boost to keep it going. Went to the same pump this time, same one I got 20mpg from and 23 mpg from, and 25 mpg from the only change I made was the lighter PS pump pulley and a new pump with a skinny 6 rib belt. Soooo here's the results. I even gave the pump an extra squeeze after shut off and let it shut off a second time. That's 33.8 mpg....
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03 QCLB- 19 to 25 mpg with electric parts, and engine mods....

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post #103 of 121 (permalink) Old 11-27-2019, 10:26 AM
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I thought long and hard last night, and I could only come up with two reasons maybe why I had freakish mpg. One, it was too cold for the fans or water pump to come on so there was very little drag from the alt if any? Maybe I did that run on just battery power? With the PWM the water pump is running @ its slowest speed when it's cold out. Other than that, I have no clue...This PWM might just be a secret weapon for better mileage with its variable speed capabilities for the water pump and fans.

Edit; One more thing I considered since the engine never reached full operating temp, maybe the piston to cylinder clearance was so tight there was no blow by? These 03's have tight pistons to begin with, and they like to melt to the cylinder when pushed too hard, so maybe that's a component of the success????

03 QCLB- 19 to 25 mpg with electric parts, and engine mods....

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post #104 of 121 (permalink) Old 11-27-2019, 10:49 AM
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On my truck filling it up till it clicks off will get readings all over the map for mpg , I fill up till fuel is visible in the filler neck at a certain spot for good results.
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post #105 of 121 (permalink) Old 11-27-2019, 10:55 AM
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On my truck filling it up till it clicks off will get readings all over the map for mpg , I fill up till fuel is visible in the filler neck at a certain spot for good results.
Ya, I hear you on that, but I used to get 16 mpg this way regularly for 15 years on this truck. I would only expect it to vary by 1 mpg by using the auto shut off.

I may do another run today (longer) and try the filler neck method. But my tank is in the bed and the neck is short, I'm afraid I'll get fuel splashed everywhere. Ah the things we do for science...
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03 QCLB- 19 to 25 mpg with electric parts, and engine mods....

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post #106 of 121 (permalink) Old 11-27-2019, 11:34 AM Thread Starter
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get it up to operating temp, then do it, if possible do a 120-130 mi run, if 33 is true, it will be cheap lol
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AFE PG7 drop in filter, AFE Torque Tube, HTT 2.5 turbo, AFE e-mani, ATS Arc Flo, 50HP DDP , 428k, HPTuners, G56, 25.065 mpg, mpg threads ->https://www.cumminsforum.com/forum/3...l#post23312562
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post #107 of 121 (permalink) Old 11-27-2019, 02:42 PM
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That filler neck method is bad, I got 13 mpg today100 mile trip running in some hills and VERY windy conditions. I will try the filler neck method again on a flat road where I got 33.

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post #108 of 121 (permalink) Old 11-27-2019, 02:53 PM
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You have to start out with it filled to a certain spot in the filler neck , than fill to the same spot every time to get repeated results , as you already found out how much it can vary from different fill rates .

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