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Thread: Gasoline in my 6.6 Duramax

  1. #21
    Join Date
    Nov 2009
    Posts
    19

    Default gas in fuel system

    a little fyi they will not void the warranty. here is the trick that the dealer uses i know i work for one.

    step1 drain the fuel out useing a hose siphon out as much as you can try to get the fuel guage to read E. change the fuel filter add stanidyne diesel conditioner to the fuel tank and add diesel to system 5 gallons. prime the system and then start let it idle for 10 min and then get it to a fueling station and fill it up again this time with diesel . it should be ok. if it is chattering or has no power then you may have a problem. but make sure that you get out as much as you can. make sure that you have some cans to put the contaminated fuel in then you have some fuel for you lawn mower

  2. #22
    Join Date
    Jan 2010
    Location
    GREELEY COLORADO
    Posts
    10

    Default

    so running gas on accident in a dmax, and it wont blow up right a way wow

  3. #23
    Join Date
    Mar 2000
    Location
    Geneva, IL
    Posts
    364

    Default Lmm

    Hi,

    Just a word that the 25% dilution threshold may not apply to LMM engines.

    FWIW.
    Rich Phillips
    Member #27
    2019 K-2500 Crew Cab Z71
    Cedar Creek Silverback 33RL Fifth Wheel
    In The Past: '82 6.2 Jimmy Blazer, '93 6.5 GMC K-2500, '01 DMAX K-2500, '09 DMAX K-2500

  4. #24
    Join Date
    May 2013
    Location
    Canada/Alberta/Rocky
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    6

    Default

    My dealer says the trucks are designed to downrate the power enough and shut down prior to any damage being done and you should be OK

  5. #25
    Join Date
    Apr 2011
    Location
    klamath Falls, Oregon
    Posts
    131

    Default

    Dmax,

    Very nice having you around. Thanks.
    Eddie
    ---------
    2007 GMC Sierra Classic 2500HD CC/LB (LBZ)
    211,000 miles / DVD player
    Kennedy Diesel Tuned Computer
    Manually extended towing mirrors
    Winter Grill Cover/screen
    Tough Country front bumper
    12,000# Warn Winch
    KC Fog Lights
    KC 130w Driving Lights
    Bradford Built Flatbed
    Firestone Ride-Rite Air Bags
    More things covered by crochet than I'll admit.

  6. #26
    Join Date
    Apr 2001
    Location
    CA
    Posts
    13,573

    Arrow

    Quote Originally Posted by gimpyhauler View Post
    Dmax,

    Very nice having you around. Thanks.
    You're welcome, alway.

    Was there a reason you're in THIS thread? Not sayin'?
    1985 Blazer 6.2
    2001 GMC 2500HD D/A
    dmaxmaverick@thedieselpage.com

  7. #27
    Join Date
    Oct 2014
    Location
    Long Beach
    Posts
    1

    Default Just takes some work to correct.

    2006 Chevy Silverado 2500HD, Allison, Duarmax 6.6L:
    Put 24 gals of gas into the tank that still had about 1.5 gals of diesel remaining.
    Drove 9 miles. Other that a slight increase in diesel noise everything seemed OK. Parked it and shut it down.

    Returned to truck 2 hours later, would not restart. Tried 3 times, then flashed back to image of the pump and realized I grabbed the wrong nozzle.
    Smelling the filler spout confirmed the error. Embarrassing tow truck ride home.

    Fixed it by:
    Used a siphon pump and several gas containers to empty tank.
    Replaced fuel filter.
    Added 5 gals diesel.
    When priming filter, I kept pumping until only diesel came out the bleeder port.
    Caught overflow in a drain pan.

    Ready to try starting. Figured I'd give it 3 tries for 10 secs each.
    First and second tries did nothing but crank the engine and further purge the fuel lines.
    On the third try it fired up, ran erratic for about 10 secs, then smoothed right out.

    Drove to gas station filled it with diesel and normal engine sounds and exhaust smell returned. All seems to be fine now.
    Phew!

    My gardener just scored 25 gals of free lawnmower gas with a little diesel fuel additive.

  8. #28
    Join Date
    Feb 2015
    Location
    texas
    Posts
    1

    Default

    A couple years ago I put gas in my diesel engine, it sat for a week or so, it now cranks and runs after I drained the tank and lines but only when you prime the filter, once you quit priming it quits running. What could this be

  9. #29
    AKMark is offline Building another 6.2L powered vehicle
    Join Date
    Dec 2006
    Location
    North Pole, Alaska
    Posts
    400

    Default

    You could have a leak in the filter housing, allowing air in which shuts it down.
    05 2500HD CC LB LLY, 4x4, 3.73s 235/85R16's, webasto cab heater, to keep it warm.
    03 Buick Rendezvous - When you average over 80 miles per day driving around, you need one of these.
    85 K-5, 6.2, SM465, Rockwell T221, 1 tons, 36's. More goodies to be installed as time and money allows.
    82 K20, 6.2, SM465, NP208, stock except for bed rack, snow plow, and glow plugs are on a toggle switch. It works great for plowing!
    72 Postal Jeep - Yet another project

  10. #30
    Join Date
    Feb 2000
    Location
    Montana
    Posts
    11,382

    Default

    Quote Originally Posted by pascuzzo View Post
    2006 Chevy Silverado 2500HD, Allison, Duarmax 6.6L:
    Put 24 gals of gas into the tank that still had about 1.5 gals of diesel remaining.
    Drove 9 miles. Other that a slight increase in diesel noise everything seemed OK. Parked it and shut it down.

    Returned to truck 2 hours later, would not restart. Tried 3 times, then flashed back to image of the pump and realized I grabbed the wrong nozzle.
    Smelling the filler spout confirmed the error. Embarrassing tow truck ride home.

    Fixed it by:
    Used a siphon pump and several gas containers to empty tank.
    Replaced fuel filter.
    Added 5 gals diesel.
    When priming filter, I kept pumping until only diesel came out the bleeder port.
    Caught overflow in a drain pan.

    Ready to try starting. Figured I'd give it 3 tries for 10 secs each.
    First and second tries did nothing but crank the engine and further purge the fuel lines.
    On the third try it fired up, ran erratic for about 10 secs, then smoothed right out.

    Drove to gas station filled it with diesel and normal engine sounds and exhaust smell returned. All seems to be fine now.
    Phew!

    My gardener just scored 25 gals of free lawnmower gas with a little diesel fuel additive.
    You did good! That's basically what I would recommend anyone do for a situation like yours.

    Like what you mentioned, the fuel mixture can be and should be used. It's too expensive to waste. Just use it in an engine that isn't too picky - like a lawn mower. If the mixture is mostly diesel, I'd only use 10-20% of the gas/diesel mix per lawn mower tank and the balance straight pump gas. Jim

  11. #31
    Join Date
    May 2020
    Location
    Suffolk
    Posts
    1

    Angry Gas in my 6.6 duramax

    So I need allite help here.
    So my fuel light came on with range of 64 miles. Stopped and BP talking to my wife, grabbed the green handle and started filling my truck up. My truck was still on, I ended up putting 24 gallons of gas in my truck that's when I noticed it wasn't diesel. I shut off my truck after about 2-3 minutes of idling and got towed to the dealership.
    Im curious if anyone knows how much fuel is burned at idle, should I be worried the engine is damaged? The truck was running just fine before I shut it off. Any help would be appreciated.
    Thanks Dustin

  12. #32
    Join Date
    Dec 2003
    Location
    Yukon Canada
    Posts
    1,612

    Default

    Drain the tank and filter replace with fresh diesel and some 2 cycle oil.
    Start the truck and use it the way you have in the past.
    Gasoline will not damage the engine,if the gas concentration gets to high the engine will stop running because it wasn't designed to run on gas.
    About the only damage that could happen would be to the pumps and injectors from the gas being very dry.But for the short amount of time the gas would have been in the system,don't worry about it.
    90 Chev 3500 c/c 4x4,6.2na,400 auto,4:10 gears.DSG Timing gears,main girdle, isspro tach, pyro,boost,oil and trany temp.Dual Tstats, High volume peninsular pump,on shelf, Custom turbo and intercooler 85%complete. Change of plans for the dually, it's going to get a Cummins. Both trucks are Blue 90 4x4 crews

  13. #33
    Join Date
    Apr 2001
    Location
    CA
    Posts
    13,573

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    Quote Originally Posted by Dgause View Post
    So I need allite help here.
    So my fuel light came on with range of 64 miles. Stopped and BP talking to my wife, grabbed the green handle and started filling my truck up. My truck was still on, I ended up putting 24 gallons of gas in my truck that's when I noticed it wasn't diesel. I shut off my truck after about 2-3 minutes of idling and got towed to the dealership.
    Im curious if anyone knows how much fuel is burned at idle, should I be worried the engine is damaged? The truck was running just fine before I shut it off. Any help would be appreciated.
    Thanks Dustin
    Welcome aboard!

    It doesn't sound like anything to worry about. Let the dealer flush the system and run the diagnostics. They have a procedure for just that. If you didn't hear/see/smell anything remarkable or catastrophic, it likely wasn't an issue. While the fuel system does cycle a lot more fuel than it burns, it isn't really much at idle. It's entirely possible the gas never made it to the pump, or not enough to cause a problem. The key is getting it flushed out and replaced with some fresh #2.

    Also, if you have comprehensive insurance coverage, it will almost always cover the expense.
    1985 Blazer 6.2
    2001 GMC 2500HD D/A
    dmaxmaverick@thedieselpage.com

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