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Thread: LB7 Mileage, Exhaust, Fuel

  1. #1

    Default LB7 Mileage, Exhaust, Fuel

    It's an '01 and generally runs great. About 4 years ago upgraded to 4" exhaust thinking mileage wud improve from 18-20. Now its about 17. No other mods except KN air filter. And, its loud in the cab now with that big muffler right underneath. Thinking about going back to stock. Wud a programmer help to mileage sitch? Also, had a limp mode last year while towing a 300lb trailer behind a load of hunt gear in the truck. Changing some older fuel lines and 1.5yr old/7000mile fuel filter solved the prob. Shud I just plan on a filter chan ge at 10k or so?

  2. #2

    Default

    Welcome aboard!

    10K-15K change intervals for fuel filters should serve you well. As for the mileage drop, my guess would be injector spray patterns/fuel atomization. Do you run fuel additives? That might be a good place to start over the next 10K filter interval...

    My best LB7 mileage experience came with an ECM swap from Kennedy Diesel. He has a tow/economy tune that really wakes up and LB7, while increasing unloaded mileage. His tune is truely better than the stock OEM LB7 tune from the factory, in any measurement.
    2011 Chevrolet Tahoe 5.3L daily driver
    • Previous owner of two 1994 6.5L K3500s, '01, '02, and '05 6.6L K2500s, '04 C4500, '06 K3500 dually, '06 K3500 SRW, '09 K3500HD SRW, '05 Denali
    • Total GM diesel miles to date : ~950K

  3. #3

    Default Addfitive and upgrade

    Sounds like good advice. Since I drive it so little, I'm resolved to change the filter every 10 anyway out of concern for h2o buildup. What additive might you recomend? And, where is Kennedy diesel?

  4. #4
    Join Date
    Mar 2000
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    Loyal WI US
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    10,792

    Default

    I would recommend FPPF Total Power added filtration, and a lift pump setup.

    I can be found at www.kennedydiesel.com
    Kennedy Diesel-owner
    More than just a salesman-I use and test the products that I sell on a daily basis!
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    2002 Chev K2500HD D/A CC Long LT 11.77@ 124mph at 7700# fuel only-e.t. needs help
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    2012 GMC K3500SRW D/A CC Long LTZ Happy Birthday to me! Built 1 working day after my birthday and delivered 7 days later.
    2016 GMC K3500SRW D/A CC short LTZ

    Custom tuning in house using EFI Live tuning software!

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