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Thread: Fueling /mileage issue

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    Basic Member Amanda Kridel's Avatar

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    Fueling /mileage issue

    Do i have an 2004.5, i recently put in a fass 150 system, i have cold air intake and new bigger intake manifold and bow also a bullydog gt tune. I now have had a huge decrease in fuel mileage like 22 down to 14ish and also my truck seems to be running lean. Does anyone have ideas on what i should be gettting checked or take off?


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    Old & Grumpy! Polaraco's Avatar

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    Re: Fueling /mileage issue

    Quote Originally Posted by Amanda Kridel View Post
    Do i have an 2004.5, i recently put in a fass 150 system, i have cold air intake and new bigger intake manifold and bow also a bullydog gt tune. I now have had a huge decrease in fuel mileage like 22 down to 14ish and also my truck seems to be running lean. Does anyone have ideas on what i should be gettting checked or take off?

    Boost leaks on the intake is my immediate guess.


    2003- 3500 RWD Automatic.
    S & B intake, BD Intercooler, Pusher Air Horn, MM3 Double R Tuning, Turbo Timer, electric Flex-a-lite fans, FASS 95,
    50 HP tips, upgrade to 351 turbo, 3.42 gears, Twin air compressors, air bags, Remote dual oil filters, Hellwig sway bar, Front Winch. Home made Fuel Heater, BD Exhaust brake with Torque Lock. Tons of TLC

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    Basic Member dmuney's Avatar

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    Re: Fueling /mileage issue

    I agree with Polaraco most likely a boost leak. Do you notice the engine making any more noise than it did before specifically a rattling sound? If you say yes to the rattle, get your injectors tested asap. Oh ya one more thing check and make sure you don't have a brake caliper hanging up on you.


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    HKBIGDADDYDIESELDAN's Avatar

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    Re: Fueling /mileage issue

    Quote Originally Posted by Polaraco View Post
    Boost leaks on the intake is my immediate guess.
    Agreed sounds like boost leak

    2012 Cummins Ram 6.7L MM3 tuner full 5" Flo Pro TBE Exhaust LWBCC 4x4 Mag Hytec Double Deep Transmission Pan , Mag Hytec Rear Diff Cover
    Airlift part # 57595 7500lbs airbags ,Nitto Ridge Grapplers 35/12.50/20 on XD 829 Big Hoss ll Satin Black Machined Dark Tint 20 x 9 with + 18 offset rims,MM3 Tuner With full Custom Tunes by Ray at DRD , Autometer A13117 Pillar Pod , Edge 98004 mount adapter , Mag Hytec front diff cover, SuperNova V4 LED Headlight Bulbs

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    Old & Grumpy! Polaraco's Avatar

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    Re: Fueling /mileage issue

    so what happened here?


    2003- 3500 RWD Automatic.
    S & B intake, BD Intercooler, Pusher Air Horn, MM3 Double R Tuning, Turbo Timer, electric Flex-a-lite fans, FASS 95,
    50 HP tips, upgrade to 351 turbo, 3.42 gears, Twin air compressors, air bags, Remote dual oil filters, Hellwig sway bar, Front Winch. Home made Fuel Heater, BD Exhaust brake with Torque Lock. Tons of TLC

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