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  1. #1

    Exclamation Do you put diesel in a gas truck?

    Alright so we all know that they have products like seafoam and Lucas to clean out our fuel injectors. Whenever I was little I always remembered my dad (very smart with vehicles) putting maybe a gallon and a half to 2 gallons of diesel fuel in his 1992 GMC Sierra with the 4.3 V6. He always told me that this was one of the best ways to help clean out your engine and keep the system clean. I'm just curious if anybody ever runs diesel occasionally through their trucks mixed with gasoline. I only do this every now and then and since I have a fuel injected engine instead of TBI, I don't quite have the ratio that my dad used to use. I just filled up 23.178 gallons of gasoline and about 3/4 gallon of diesel fuel.

    What can this hurt?

    If at first you don't succeed, get a bigger cheater bar.

    1999 GMC Sierra SLT Z71 | 5.3 "Vortec" | Spectre "Cold Air Intake" | TransDapt TBS | Hypertech 30005 Tune | 2005 Chevy Tail Lights | Denali headlights | Grill Mounted Fog Lights | AWS Bug Shield | 265/70/16 Futura Scramblers | Boss HD Speakers | 2005 Overhead Console | Flowmaster Super 40 mufflers 2N1O | Mostly stock-ish
    Bigger Amp Alternator | Electric Fans | Transmission Fluid cooler | Paint (Halfway there)| Interior Restoration/Upgrade with newer model parts | Window Visors (In channel) | Tint | Low-Profile Tool Box | LEDs throughout stock cab locations (68% Done) | And whatever is spurr of the moment
    CVN-69 "IKE-ATRAZ" AIR/V-2 Gear Dawgs

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  3. #2


    Never ran diesel with the fuel but some additives do have a chemical make-up similiar to Diesel.
    Possible consequences might be an oily coating in the cat convertor, but it should burn out quick with the temps, and oily residue on pre cat sensors.
    But on the other hand it should offer lubrication to valve seals, seats, and injectors.

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  5. #3


    That was also another bonus I remember hearing about. Lube.

  6. #4


    what generation is your father from?
    sounds just like mine lol
    My dad has always told me the same thing!
    but i have yet to try it...
    2000 Chevrolet Silverado

    4.3L V6, 4L60E, 2WD, Single Cab
    Airaid CAI
    Poweraid TB Spacer
    Flowmaster 10-series exhaust (dumped)
    Edge CS insight monitor
    4.10 gears
    Limited-slip differential
    LS-1 Dual Electric fans
    Corvette tranny servo swap

    Head Unit: Alpine
    Speakers: Alpine SPR-60C 6.5" component set, 4X6 Infinity Kappas
    Subs: 2-12" Kicker CVT's
    Amps: Alpine-M1000 (subs), Alpine MRX-F65 (Speakers)

    305/70R16 NITTO Terra Grapplers
    16" PROCOMP 7089's
    2" leveling kit
    3" Fabtech Spindle Lift Kit
    Front/Rear-Bilstein 5100 shocks

    35W HID Low Beams
    RECON LED smoked roof cab lights
    HELLA LED taillights and 3rd brakelight
    HELLA FF-75 Aux. Reverse Lamps
    RIGID dually D2, flush mount, wide beam
    Hawk HPS Brake pads
    Russell braided steel brake lines
    Powerstop-red powdercoated brake calipers
    Powerslot Cryo brake rotors
    EGR in-channel window visors

  7. #5


    The Dwight D Eisenhower generation.

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  9. #6


    i have heard of the diesel fuel. I think the amount seems a bit high but if the results are positive then all the power to ya. i have also heard a small amount of atf fluid is good for injectors but i haven't tried it
    Last edited by yotchie; 09-16-2013 at 09:03 PM. Reason: typo

  10. #7


    Ive used ATF fluid in a carburated engine to loosen stuck lifters.
    It also works well in Mazda RX7 rotary engines to condition the wipers on the rotor, stops excessive oil burn.

  11. #8


    So not recommended for use in my truck (ATF)

  12. #9


    Back in the day ATF was ok. But, I have heard that it can mess up your cats and O2 sensors. I don't know if it is true or not. I run TC-W3 2 cycle marine formula in every tank with a 5 gallon to 1 ounce ratio. It is said that it lubes and cleans injectors, fuel pump, and valves. I have been running it approx 6 months and have seen an increase from between 13.5-15.2 mpg to a solid and consistent 17.4 mpg in the city. Not to mention a smoother idle

    1995 Silverado 4x4
    6" BDS Suspension Lift-3" Body Lift-Add A Leaf in rear -Trailmaster SSV Shocks-Duel Steering Stabilizer Kit -AirAid Cold air intake-
    4.56 Gears with Detroit Auburn Locker-Pro-Comp Traction Bars with duel shocks-Aluminum Skid Plate Kit-38.5" x 16.5" Mickey Thompson Baja Claws-Constant Dropping fuel gauge

    2005 Yukon XL Jet Power Programmer, Bilstein Shocks, Bilstein rear springs, Helwig Anti-sway bars, EGR Window Visors, EGR Hood Shield, Denali Headlights, Headlight harness upgrade, GE NightHawk Bulbs, White Night Rear lighting system, Russell Braided SS brake lines, PowerStop Brake pads, PowerStop cross drilled and Slotted Rotors,
    2002 Silverado ext cab 2wd (Sold)
    2003 Yukon XL (Totaled)

  13. #10


    Heck I need me some of that

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