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Duramax 6600 Welcome to the Internet's first Duramax 6600 diesel discussion forum for the LB7, LLY, LBZ, LMM, LML, LGH & L5P RPO code engines. Tips on performance, fuel economy, troubleshooting and more.

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  #21  
Old 12-04-2009, 10:05 PM
mastertech mastertech is offline
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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
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  #22  
Old 02-03-2010, 12:51 AM
havenopower havenopower is offline
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so running gas on accident in a dmax, and it wont blow up right a way wow
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  #23  
Old 03-19-2010, 03:18 PM
richp richp is offline
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Default Lmm

Hi,

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

FWIW.
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  #24  
Old 05-30-2013, 09:57 PM
ceide4489 ceide4489 is offline
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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
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  #25  
Old 06-03-2013, 05:54 PM
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gimpyhauler gimpyhauler is offline
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Dmax,

Very nice having you around. Thanks.
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  #26  
Old 06-03-2013, 07:50 PM
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DmaxMaverick DmaxMaverick is offline
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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'?
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  #27  
Old 10-06-2014, 12:05 AM
pascuzzo pascuzzo is offline
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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.
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  #28  
Old 02-18-2015, 12:03 PM
pippin pippin is offline
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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
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  #29  
Old 02-18-2015, 01:05 PM
AKMark AKMark is offline
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You could have a leak in the filter housing, allowing air in which shuts it down.
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  #30  
Old 02-18-2015, 01:31 PM
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More Power More Power is offline
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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
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  #31  
Old 05-20-2020, 10:26 PM
Dgause Dgause is offline
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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
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  #32  
Old 05-21-2020, 10:42 AM
Yukon6.2 Yukon6.2 is offline
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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.
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  #33  
Old 05-21-2020, 11:15 AM
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DmaxMaverick DmaxMaverick is offline
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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.
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