I am probably as sick as everyone else with the diesel prices and have located a local bio station that sells b100. I have an 53gal auxillary tank in the back and thought of filling up and turning off the gravity feed until the main gets to half then let fill back up. I have read that Cummins approves b5 and that even some people are using straight b20. I cannot find a b20 in Houston but the b100 @ 3.29/gal is looking nice to mix vs. 3.75/gal. Do you think this will work? Thanks for the help in advance.

BTW: 2006 5.9 No mods w/ 65k miles on it. Runs great. Don't want to screw it up.

 

cummins allows b5 on civilian vehicles, so if you run a higher mix of bio, and need to use your warranty for a fuel system or motor issue, you could have a problem.

 

Hello,

Main concern is water in the bio fuel. You need to add water stripping filters to bio mixes between b5 and b20 according to Dodge. Personally I would add some marine water separators and run b100 straight if I could.

Damon

 

Biodiesel is one of those mystery fuels. There are 100 ways to make it and about 2 are correct. There are no set regs. or standards for it, so that is why I am shy of it... for now. If you know the guy, ask him on his process. Some wash the fuel, some dont. Some use oils that oxidize quickly and polymerises. How much money are you truly saving when you gunk up some injectors with bad bio and you need 3500$ worth of parts? It is great if you know how its made and the quality control, but like I said, there is no standard here.

If you ask around... there will always be some guy that ran b100 for 30k miles with no problems. The HPCR is a different animal and needs good fuel.

 

i think that's cummins' logic, as well. they can't say to go ahead and use it, if they have no idea how it was made.

 

Biodiesel from a fuel station should have passed ASTM ceritfication and is a direct replacement for diesel fuel. Yes there are 100 ways to make poor fuel but if your getting good fuel from a reputable station then you should be good to go. The government vehicles are still covered for higher percentages of biodiesel....its the same engine, they just know the government agencies arent using backyard methods of mixxing this and that and calling it biodiesel. The cummins will run on 5% almost anything and diesel, its just a protection against idiots. that being said how does the dealer know you went over 5% biodisel anyways.

I agree get the filter setup and run the bio, its better fuel anyways, I wish I had a source for that price too.

 

I agree with this. Inorder to sell biodiesel, it needs to be ASTM certified. Also, the water part is a little bit untrue about biodiesel. I think that the whole biodiesel having water in it came from the backyard brewer. Of course I make some bio and run it in my truck but buying it at a store is so much safer in my eyes. For your truck running the common rail pressures that you do I would follow your cummins recommendations. I know many people who are running b100 in duramax, dodge, and ford trucks with high pressured fuel systems without troubles but one batch of bad fuel can ruin anything. Same with diesel. Good luck and the b100 you buy might give your truck some life. With the bio, you will have better fuel lubricity and the particulate matter will be down considerably.

DK