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Old 10-30-2013, 09:12 PM   eBay Motors  #1 (permalink)
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Dilemma on CNG and Warranty

I have a dilemma on whether I should have my truck converted to run as a dual fuel CNG/Diesel truck and take a huge risk loosing the warranty or leave it alone?
I paid extra for the 100,000 mile bumper to bumper warranty and I am only 18,000 miles into it.
The reason that I bought the truck in the first place was because it was a clean diesel and had the potential to get even better mileage with a few modifications. I have been exploring CNG for a while and it makes sense in many ways. The downside is that GM makes it clear that I take a risk of loosing my warranty if something goes wrong with the addition of another fuel type modification. The truck has only had one major issue and that is it goes into Regen way too often (that could be the steep hills that I tend to drive up here in Idaho).
1.What should I do?

2.Are there parts that are known to be a problem on the 2012 LML that I should be aware of that I may need warranty help with in the future?
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Old 10-30-2013, 09:14 PM   eBay Motors  #2 (permalink)
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if you paid extra for warrenty i kinda think you should atleast wait till its up then do whatever you want with the truck or else you can consider that money wasted lol
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Old 10-30-2013, 09:14 PM   eBay Motors  #3 (permalink)
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I would not.
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Old 10-30-2013, 09:20 PM   eBay Motors  #4 (permalink)
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that's kind of where I am right now....Some folks out here are claiming to get over 30mpg or more using CNG. @ 1.50 gallon that makes a huge difference. I am also torn on whether to take the risk. The system installed by a qualified technician is not cheap however they do a lot of GM work locally on the injectors. Still weighing my options...
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Old 10-30-2013, 09:28 PM   eBay Motors  #5 (permalink)
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It matters not if it's a natural gas conversion, twins or removing the dpf/def.
You will lose both the coverage and the money spent on the extended warranty.
And, the math (100k-18k) says it'll be for about 4 more years.
Tough call.
Or, you could buy an LBZ.
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Old 10-31-2013, 02:01 AM   eBay Motors  #6 (permalink)
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Quote:
Originally Posted by 2006duramax5 View Post
if you paid extra for warrenty i kinda think you should atleast wait till its up then do whatever you want with the truck or else you can consider that money wasted lol
x2.
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Old 10-31-2013, 02:42 AM   eBay Motors  #7 (permalink)
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I'd hold off if I were in your boots.
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Old 10-31-2013, 03:55 AM   eBay Motors  #8 (permalink)
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Some guys claim 30 mpg on diesel and a lift doing 95+mph.


Cant you cancel the extended warranty and get a refundof unused portion? Still would void your factory warranty
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Old 10-31-2013, 10:22 AM   eBay Motors  #9 (permalink)
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I am going to look into canceling the extended warranty if I do go forward with a CNG Dual Fuel Conversion.

Here is what I know about CNG
  1. It allows the combustion to be more complete hence less soot in the DPF
  2. It is a dual fuel system whereby CNG is injected directly into the air intake system and the diesel fuel is still the primary source of fuel
  3. Unlike gasoline engines which are all or nothing meaning that one has to select a single source of fuel, the diesel allows one to add CNG while underway.
  4. While my diesel consumption may decrease, I am still burning energy...just a much cheaper form of it ($1.50 a gallon for CNG vs. $4.07 for diesel).
  5. When installing or having a system installed I accept the financial liability if something goes wrong and GM has the ability under the law to use such to void all financial liability on their part.
This is a lot to consider, with some serious implications both good and bad financially. It would however be awesome if I could do the conversion without the risk.
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Old 11-01-2013, 10:03 PM   eBay Motors  #10 (permalink)
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After a few contacts in the last few days, I was able to get an answer from some authorities on a CNG conversion.

The government requires that the manufacturer warranty any alternative fuel vehicle such as CNG if the following is true or occurs:
  • The system is EPA Certified for that Vehicle
  • The Conversion was done by an authorized installer Certified by the EPA
I was given a list of several in the Western States, everyone I spoke with stated that the government has not certified a CNG conversion kit for the LML Duramax yet. There are kits out there, but they have not received the blessing of the EPA yet. Long story short is they all encouraged installing a dual fuel system but they all stated that I would be on my own if something happened while it is still under warranty. That is kind of a deal breaker....as much I want to add CNG, it is just too much risk right now.
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