Fuel gauge problem? - Chevy and GMC Duramax Diesel Forum
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Old 03-27-2012, 05:40 PM   eBay Motors  #1 (permalink)
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Fuel gauge problem?

Hey guys I'm a new member of the forum and i was wondering if anyone could help me. I just bought an 06 duramax and my fuel gauge seems to be giving me trouble. When I fill my truck up close to "E" it only lets me put about 14 or 15 gallons in it. I have the short bed so I have the 26 gallon tank. Also when I fill it up the gauge works like it should, it goes to full and works all the way to empty but im only getting about 220 miles or so until it gets to "E". My average eco says im getting 16 though. So by my math I should get about 400 miles to a tank if i run it all the way to "E" right? My father-in-law is a mechanic and he thinks its the sending unit but I really dont want to drop 360 bucks on a new one if that is not the problem. Any help would be great. Note: The fuel range on the dash reads approx. 360 miles when I fill up and drops about 30 miles when I've only been about 3 miles.
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Old 03-29-2012, 07:31 AM   eBay Motors  #2 (permalink)
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Ya mines doing the same thing, well its been like that since I bought it 5 months ago. My plan is to just carry a can full of diesel and drive till it runs out. I have the w/t package so I don't have the d.I.c. to tell me anything.
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Old 03-29-2012, 07:33 AM   eBay Motors  #3 (permalink)
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I have a lmm and it's the same way. Gm made it that way so you don't run your diesel out of fuel. Just a safety thing.


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Old 03-29-2012, 08:08 AM   eBay Motors  #4 (permalink)
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I have a lly and does the same thing. When its on e I can only put 16 gallons in it. Which means theres still 10 gallons in there. I heard it is a safety thing as well but ten gallons is a bit much.

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Old 03-29-2012, 08:35 AM   eBay Motors  #5 (permalink)
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My LMM does the same thing. I have replaced my sending unit already (warranty) to try and fix it but did nothing. My DIC is accurate to the amount of fuel burned. I have a 26 gallon tank too and just run it till it shows I have used 22 or 23 gallons of fuel. Works for me that way. GM should have either fixed the issue or allowed for larger tanks on a diesel if they wanted to be that conservative with fuel. At least the new LML trucks come with 36 gallon on the shortbed now.
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Old 03-29-2012, 08:38 AM   eBay Motors  #6 (permalink)
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It's normal. My 06 is the same. I just get in the habit of watching the "fuel used" on the DIC. Once it gets to about 22 gallons used then i start seriously thinking about fueling up very soon. My truck is lifted on 35's and doing it that way i get about 280-290 miles out of it according to the DIC. I've never hand calc'd it so it could be more, could be less.
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Old 04-01-2012, 04:23 PM   eBay Motors  #7 (permalink)
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Thanks for the help but im kinda thinkin that a 10 gallon safety is a little much too...my buddy has an 03 duramax and we just got back from a 200 mile trip one way...we were both pulling campers, i was pulling a 6600 lb ultra lite and he was pulling a 7500 lb fifth wheel...he got all the way there on a little less than half a tank and when i got there i was on "e". we both have a short bed and both got about 12.5. I dont know what the problem is. and trial and error can get expensive.
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Billet Bowtie, Black Diamond Plate Bed Caps, 20% Tint, 265/75/16 Destination M/Ts on the stockers, and one of these days when my wife quits wrecking it I'll have more
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Old 04-06-2012, 04:26 PM   eBay Motors  #8 (permalink)
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alright update..... a guy i work with dad has an 02 lb7 (correct me if im wrong) and he told me he had the same problem and just changed the sending unit to fix it. will this fix the problem? for the time being im doing what socal06dmax is doing and just watching my fuel used on the dic
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2006 Chevy 2500HD (Loaded)
Crew Cab Short Bed
LBZ 4x4 w/ 6 speed Allison

Billet Bowtie, Black Diamond Plate Bed Caps, 20% Tint, 265/75/16 Destination M/Ts on the stockers, and one of these days when my wife quits wrecking it I'll have more
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