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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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Old 06-01-2006, 06:36 PM
Javy Javy is offline
Join Date: Jun 2006
Posts: 11
Default Gasoline in my 6.6 Duramax

I own a 2004 GMC with 33k miles.
Last night my designated pumped gasoline in my Duramax.
Gas gauge was in the RED and pumped $20 of unleaded gas.
My truck quit after driving about 10 miles up a montain road.
How much "long term" damage might this have caused ?
Do I dare take it to GMC dealer to drain gas and purge fuel lines
since they might VOID my extended warranty ?
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Old 06-01-2006, 08:30 PM
Robyn's Avatar
Robyn Robyn is online now
Missy Good Wench ( Moderator)
Join Date: Apr 2001
Location: Newberg Oregon
Posts: 10,340

Siphon the tank out well and fill with fresh fuel and change fuel filter.
The unit should recover ok. The Durabucks does not use a pump like the 6.5 so it should be ok once you feed it what it likes.
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Old 06-01-2006, 08:49 PM
Javy Javy is offline
Join Date: Jun 2006
Posts: 11

I talked to the Gale Bank Engineering tech guys and told me that if
the engine shut down at idle,they wouldn't be concerned.
The fact that it shut down under a load climbing a mountain
is a concern.
I realize there are other threads regarding this but my concern is the
high concentration of gasoline versus diesel in my tank at the time of shutdown.
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Old 06-02-2006, 01:20 AM
DmaxMaverick's Avatar
DmaxMaverick DmaxMaverick is offline
Join Date: Apr 2001
Location: CA
Posts: 12,353

There will be several here that will preach otherwise, but I say no harm done. My significant other(s) made a habit of pumping the wrong fuel into EVERY Diesel (5.7, 300D, 6.2, 7.3, 6.5, 6.6) I've had since day one. It's gotten much better lately, though.

If you have $20 of #2 in it, that's not much, these days. I say fill'er up, bleed it, and run out the fuel. Fill up again at 1/2 tank, and don't look back. Adding a little extra additive in the meanwhile will help with the missing lubrication. The gas at less than 25% won't hurt anything. At all. If it makes you feel better, drain the tank first, but nothing will be gained.

Anyone that believes otherwise can show up with evidence gas has ever harmed a Diesel engine. If the Diesel concentration is too little, the engine just quits. Only damage that can happen is lack of lubrication if the mix is ran for too long. Add some lube, and don't worry about it. Don't worry about changing the fuel filter, either, unless you think you got some dirty gas. If you think you've never ran gas in your Diesel engine, think again. There will be at least 5% in every tank you pump from your favorite supplier, and most of the time much more. Pull a sample and check it out. You may be surprised.
1985 Blazer 6.2
2001 GMC 2500HD D/A
2014 Chevy Cruze Diesel - Fabulous car, no problems at all, but sold Nov. 2016 @ 55K miles.
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Old 06-02-2006, 06:51 AM
Kennedy Kennedy is offline
Long Distance Crew Chief for BMDMAX
Join Date: Mar 2000
Location: Loyal WI US
Posts: 10,691

It's not a good thing to do, but it's done and you are not the first. 9 out of 10 drain, refill, etc w/o issues. Occasionally we hear of the poor guy who paid $15k for a new engine (or submitted to Insurance) which was probably unnecessary.

I think there are a lot of scammers out there that would try to rip a guy off in this position...
Kennedy Diesel-owner
More than just a salesman-I use and test the products that I sell on a daily basis!
Superflow Lie Detector in house
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.
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Old 06-02-2006, 02:17 PM
JoeyD JoeyD is offline
Join Date: Jun 2000
Location: Arlington,MA U.S.
Posts: 1,666

Change out the filter as well. I say no harm done.
1998 6.5 2500 4X4 dynatrac pro 60, ARB, 35"BFG's
06 D Max Express 5"MBRP EFI live
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Old 06-03-2006, 11:44 AM
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More Power More Power is offline
Join Date: Feb 2000
Location: Big Sky Country
Posts: 10,506

Pull a couple of the glow plugs, looking for evidence of heat damaged tips - like blisters or fractures. If the glow plug tips appear undamaged, so will the remainder of the engine.

A few years ago I heard from a fellow 6.5 member who (through a mixup at the pump) filled a half full tank the rest of the way with gas. He drove some number of miles till the problems started.... His fresh rebuilt 6.5 was eventually torn down. He reported all eight glow plug tips were burned off and the pistons suffered from heat fractures.

How hard the engine was worked with the gas mixture likely plays a part in what happens, as well as what the percentage of gas is in the fuel mix.

A 100% gas mix probably wouldn't allow the engine to run at all, but some % apparently causes high combustion temps.

I vote drain the tank, fuel lines, and fuel filter. Best not to take a chance.

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Old 06-04-2006, 05:14 PM
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carco carco is offline
Join Date: Mar 2001
Location: williamsburg, ohio ,usa
Posts: 340

Change the filter fill w/ diesel maybe add some additive w/ lubricity qualities, and run it, fill up @ 1/2 tank and enjoy your truck. Our shop has done many, although not an HPCR fuel system, would not think you should have a problem. bob............
Bob O.
2004 K2500 DA LLY CC LT LB Wow! Edge w/A + BS + CAT pre fuel filter, 06 air box,
2002 C6500 EC. 7.2 Cat NoMar rollback/ 92 C7500, 7.2 Cat, 25ton No-Mar / 2005 C5500 D/A rollback / 1969 Corvette 350-350 4spd AC T-top stock orginal
XP850LE WOW nice ATV, 09-550XP hers, 03-Predator, 04 Honda400EX, 05-Banshee, 08-KTM525, 08 KFX700, 38' enclosed GN hitch
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Old 06-06-2006, 05:40 PM
Mark Rinker's Avatar
Mark Rinker Mark Rinker is offline
Join Date: Jun 2003
Posts: 5,813

Any update for us on this one? I have been hoping to hear good news that you are back up and running!!!
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
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Old 06-19-2006, 03:05 AM
Javy Javy is offline
Join Date: Jun 2006
Posts: 11

I'm up and running fine,which I had no doubts it would.Like I
said before,I was concerned about long term damage.After serious
research, I'm convinced the computer shut my truck down before
any serious damage was done.( I hope).It was suggested to me to
add some ATF to fuel tank but I added a German diesel additive instead.
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