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Old 09-25-2015, 11:21 AM   #101
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I see a lot of people in this thread have newer Rams with the 6.7. I purchased one about a month or so ago. When we took our first long trip I noticed that the truck makes a "spark knocking" sound when pulling small hills at lower RPMs. I realize diesels do not have spark plugs, but I do not know another way to describe this. Later in the trip with some different fuel it was not as bad, but it never went completely away. I have driven a VW diesel for years and never had this problem. Is this common when towing with a diesel truck? Has anyone else experienced it? I had the cruise control on (about 65mph) most of the time when it was doing this.
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Old 09-25-2015, 12:12 PM   #102
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Sounds like engine was "working"... Far different than "roar" of a gas rig pulling a load!!!

If changed with fuel, and environmentalists were EXACTLY the same, could be bio-diesel vs regular diesel. I have seen some "poor mixtures" / blends around here and try to buy where the diesel pumps get a lot of use!

Try some Cetane boost next few fill ups!!!
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Old 09-25-2015, 01:07 PM   #103
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Has this only happened on the trip. Was the fuel stop before you noticed this selling biodiesel mix. Do you remember the if it was B5, B10 or B20? Where did this happen. Do you remember the brand of fuel?

No messages appearing on your dash?

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Old 09-25-2015, 01:12 PM   #104
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I bought diesel at a local place before leaving town, but it was a place I have never bought diesel at before. It is one of those places that sells Shell gasoline, but their diesel pump says "Not a Shell product." Conveniently enough, it does not say who the diesel fuel is from. I will try to stop by there on the way home and see if it has a Biodiesel sticker on the pump. During the trip we used Flying J truck stops and then Valero once in Florida. It did get much better as the trip went on. I was thinking it was primarily crappy fuel from the fill up right before the trip. I should also mention the few times the hills were steep enough for the truck to gear down the sound immediately went away at higher RPMs.

No warning messages on the dash. The truck ran perfect other than the sound.
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Old 09-25-2015, 01:23 PM   #105
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Plan to replace fuel filter ...
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Old 09-25-2015, 01:36 PM   #106
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The truck just had new fuel filters installed before I bought it. That may have saved us. As you say though, I may have to replace them now. I think I will go ahead and pick up one of each (two I think). I actually run an auxiliary 1 micron fuel filter on my VW Golf diesel to protect it. I have never had any problems with water gathering in that filter, but then again, I have never bought diesel fuel at that particular station. I prefer to use the local Murphy (Walmart) station because it constantly has diesel traffic and fresh fuel (but they still have a sticker that says as high as B20 is possible).
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Old 09-25-2015, 01:37 PM   #107
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Plan to replace fuel filter ...
Yes, do so.

Your Cummins has a common rail fuel delivery system and impurities get recycled back into the fuel system. This can over time result in damage to the injectors (a very expensive repair). Your fuel filter is, I believe, a 2-stage one filtering down to 2 microns. You don't want it to get clogged.
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Old 09-25-2015, 01:39 PM   #108
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There are two filters, one under the bed over the fuel tank and one in the engine compartment. The one under the bed looks like a difficult to get to and I can imagine getting rained on my diesel. So both filters would need to be replaced.

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Old 09-25-2015, 02:04 PM   #109
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Thanks guys. I just started back to school this week so I will try to find the location of the filters when I get time. I hate to replace them after only 2000 miles of use, but I may do so anyway.

It sounds like the Cummins does like my VW and uses the diesel fuel to lubricate the roller bearing in the high pressure fuel pump and then recycle what is not pumped to the fuel rails back through the fuel tank again. This is why I added the 1 micron filter to my VW. It is on the recycle side of the high pressure pump before it goes back into the fuel tank to catch impurities and the million pieces of metal debris if the fuel pump ever implodes (which is pretty common with the Bosch HPFP on the VW).
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Old 09-25-2015, 10:21 PM   #110
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Avoid bio-diesel like the plague. It plugs filters. My 2012 Cummins had a warning of less than 5% bio-diesel. My two Mercedes V6 3.0L diesels (2007 & 2009) have warnings from their service department to NEVER use bio-diesel.

I carry spare full filters in the Mercedes as their fuel filter is so small.

On the Ram, I have a Cummins branded water separator coming out of the Titan replacement 56 gallon diesel fuel tank. The fuel then goes through the stock Dodge fuel/water separator on the side of the engine and then proceeds through a Cummins branded 2 micron fuel filter cartridge. I carry spare filters in the Dodge.

Keep the rpms up so the engine does not lug (makes a groaning sound) which happens at low rpms. That means staying above 1,450 rpm. Peak torque is at 1,650 rpm or 65 mph. There is a down/up transmission shift button on the right stalk beside the steering wheel. Use it!

We have just over 34,000 mies on the truck and it runs smooth and quiet.
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Old 09-25-2015, 10:26 PM   #111
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A lot of fuel stops have only biodiesel. What if it's the only choice and you don't have enough range to go to the next town? You know sooner or later all stations will have to carry biodiesel.

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Old 09-26-2015, 06:22 AM   #112
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I found on our trip west that in truck stops the Auto Diesel was Bio Diesel and the truck islands said nothing about being Bio, so we pulled in there, much to the chagrin of one trucker in particular. I asked a more friendly trucker and he told me that if the sign says Trucker Diesel it is not Bio.

Not sure if correct, but our Ford 6.7 ran great for 10,000 miles this past summer except for one tank of what I knew was Bio. Put in two bottles of additive to try and clean it out and changed filters in Moab.
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Old 09-26-2015, 06:47 AM   #113
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Are you saying 10000 miles without Bio and then one tank of Bio and your engine started running bad enough to add additives and to change filters? Your Ford is B20 compatible.

So do most truckers get ticked off when they see RVs using truck pumps? All the big DP with cars in tow have to use those facilities.

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Old 09-28-2015, 05:01 PM   #114
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Are you saying 10000 miles without Bio and then one tank of Bio and your engine started running bad enough to add additives and to change filters? Your Ford is B20 compatible.

So do most truckers get ticked off when they see RVs using truck pumps? All the big DP with cars in tow have to use those facilities.

Kelvin
I have had NEW filters get clogged with one load of BIO... it's all politiks...
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Old 09-28-2015, 05:19 PM   #115
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The company I worked for was a distributor for heavy duty industrial and truck diesels. I remember speaking to the manufacturer we represented years back about bio diesel. They said that things like lubricity and other specs weren't the usual problem with bio diesel, it was the frequent lack of quality control and testing to ensure it conformed to specs which meant that it was often an unknown. They likened it to the wild west, and took it all down to risk management. That stuck with me. If still true, we should focus less on whether we bought a tank of bio fuel, and more on whether we bought a tank of fuel with questionable quality control. The bio part is incidental.
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Old 09-28-2015, 10:21 PM   #116
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The company I worked for was a distributor for heavy duty industrial and truck diesels. I remember speaking to the manufacturer we represented years back about bio diesel. They said that things like lubricity and other specs weren't the usual problem with bio diesel, it was the frequent lack of quality control and testing to ensure it conformed to specs which meant that it was often an unknown. They likened it to the wild west, and took it all down to risk management. That stuck with me. If still true, we should focus less on whether we bought a tank of bio fuel, and more on whether we bought a tank of fuel with questionable quality control. The bio part is incidental.
Wellllllll, it was "Willie Nelson Bio-diesel"...'just saying... But it was a pretty green!

We had lots of diesel in tug and push boats.. The bio stuff has a "shelf life" for shore. One thing we did was haul in fresh fuel when a distributor pushed a bunch of bad fuel into "poor area" stations because they had gotten away with it before... Well, turns out there were some "politicians" in the area who pumped the bad fuel into their "cars"..... Well, the stuff hit the fan. All the "affected" cars were repaired....

I am sure they learned their lesson... They won't do that again during "election" cycle!!!!
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Old 09-28-2015, 10:31 PM   #117
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No problems with truck stops. Typically I spend more then a few days at RV parks along my route and in doing so I usually unhook to go grocery shopping etc at which time I usually fuel up. So it is not often that I need to pull in and fuel with the trailer.
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Old 09-29-2015, 07:41 AM   #118
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:I filled with a bio- fuel in Minnesota, a driver told me it was made from beans, no problems pulled good, same mileage, in an 07 dodge with 6.7. And this isn't someone told someone and they told me....
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Old 09-29-2015, 08:10 AM   #119
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I like B10

I have used a biodiesel blend of at least B5 from tank #1 on my 2014 RAM EcoDiesel. I now have just over 28,000 miles in 15 months of ownership. No problems at all. It is certified to run up to B20 with a few adjustments to the maintenance schedule. I prefer B10 for its increased lubricity and detergent properties.

Fuel quality varies greatly from station to station and state to state. Some states have no regulation for diesel labeling at all. In Texas, if you are fueling in one of the "affected" counties (basically east of US 281) you will probably be getting at least B5. Texas has a "Low Emission Diesel" program. The diesel must meet some basic minimum standards, like a cetane rating of 48.
https://www.tceq.texas.gov/airqualit...eandiesel.html
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Old 09-29-2015, 08:15 AM   #120
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So for the major companies, Pilot, Flying J, Loves etc, that show bio diesel at some of their locations that also have semi truck islands is the biodiesel only at the car island is there non bio diesel is at the truck islands? Or is biodiesel at both?

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