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6.5L Diesel Engine Discuss the 6.5 GM diesel engine & associated components.

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Old 09-07-2004, 12:20 PM   #1 (permalink)
Slapshot
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Here in Sask. the government doesn't charge road tax on farm or off road diesel and they mark this fuel with an amber dye.


I was talking to a guy a couple of days ago and he told me that my 6.5 won't run properly on this dyed fuel. He said that it screws up the optical sensor on the IP.


Anyone else heard this?


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Old 09-07-2004, 12:32 PM   #2 (permalink)
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Quote:
Originally Posted by Slapshot


Here in Sask. the government doesn't charge road tax on farm or off road diesel and they mark this fuel with an amber dye.


I was talking to a guy a couple of days ago and he told me that my 6.5 won't run properly on this dyed fuel. He said that it screws up the optical sensor on the IP.


Anyone else heard this?


Slapshot


As a mater of fact I have been told this also. When 6.5 were but a few years out some people in Alaska had been running off road fuel in their 6.2's started using it in their electrionic 6.5 trucks also. The mechanic's would, using a 5 gallon gas can of clean fuel, reroute the fuel pickup out of that can, runn the truck till it would start running right in the shop, just to make sure that this was the problem. They then charged the owner to drain and flush the truck tank and refill with good fuel. Never had this problem myself but that's their story and they were sticking to it.


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Old 09-07-2004, 12:41 PM   #3 (permalink)
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I know of a "Farm" EFI 6.5 burning dyed fuel with no problems. As far as I know it's been using it for years.
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Old 09-07-2004, 04:55 PM   #4 (permalink)
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I have seen the same thing happen. over time the dye has in some cases been known to stain the optical enough to make it act erractic. I would not run it in my own truck, but some people do.
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Old 09-08-2004, 01:16 AM   #5 (permalink)
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i run farm fuel in mine probably 50% of the time and havent had a problem yet.
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Old 09-08-2004, 03:55 AM   #6 (permalink)
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Quote:
Originally Posted by steiner43511
i run farm fuel in mine probably 50% of the time and havent had a problem yet.

glad to hear that and hopefully what ever was the problem early has been corrected in later models.


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Old 09-08-2004, 11:16 AM   #7 (permalink)
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The only reason that I ask is when I was away with the truck on holidays I was burning pump fuel for about 800 miles and it was running great. Now I am home and have put a couple of tanks of dyed fuel through it and it doesn't have the same feel as before. Nothing I can quantify, just a seat of the pants type thing.


Thanks


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Old 09-11-2004, 07:32 PM   #8 (permalink)
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Dyed fuel will not hurt anything. Been doin it for 250k I think it is fresher and the added sulpher keeps everything slicked up inside QM is rightEdited by: justin25taylor
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Old 09-11-2004, 08:00 PM   #9 (permalink)
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Sulphur content, in and of itself, has nothing to do with performance or lubricity of diesel fuel. Rather, it is the processing that the fuel has to undergo to remove the sulphur that robs the fuel of its lubricity. Farm fuel does not have a different sulphur content from Road fuel, the dye is the ONLY difference and its there to keep track of who is and isn't paying their taxes.


That said, I've never heard of a complaint of the dye causing any problems with any IP. Diesel fuel, dyed or not, all needs to be treated with a lubricity additive at a minimum, cetane, lowered cloud point etc, those are all icing on the cake.
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Old 09-11-2004, 10:16 PM   #10 (permalink)
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Dyed fuel is great until the state DOT folks stop you and check your tank. It gets very expensive paying the federal and state fines. It can be in the thousands. The dye is hard to get rid of so don't think changing to undyed fuel clears it up. Around here in NC they stop all diesels including pickups at random places.
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