skindaddy

if you have an 2micron filter setup, why do people say not to use b100 in are trucks, where some say 05 or later?
homemade would be b100 correct!
other than gelling and filtering whats the deal?

bigblock2stroke

Too much water content for single filter.

DBLR

Not all fuel filters are good at or can strip water out of diesel. Heck even a Fleetguard Stratapore filter is only good for up to 5% Bio. Cummins will tell you if you use more then 5% you need to have a better fuel filter set up then what comes from the factory to take care of the water that Bio can/may contain.

skindaddy

gotcha so if you had an airdog w/ seperator inline with factory filter would work right?
basically its about filters, and water, not that the motor wont burn it right if done properly.

to me it seems no matter the motor,even a 7.3joke!! or brand it'll work when precautions are taken.

DBLR

The quality of the Bio you use or make is another thing that can affect how well your engine will or will not run.

SOhappy

I wish we could finally put this thing to rest.

http://www.everytime.cummins.com/eve.../release99.jsp

skindaddy

put what to rest? just wanting to know without having to spend 40 hours a week for 4 yrs to learn everytrhing on internet, 1says this 1says that.
i just dont grasp why my customer burns bio all day long in his ferd, but 5%-20% is best for us.
but thank you guys for all the answers

John Faughn

Also with the high presssure common rails , there is a problem with the high pressure polymerizing the oil , this makes it kinda stringy & can plug up filters & the hole system .
You can get bad fuel of all kinds , weather its pump diesel , pump bio , and home made could be your worst , because so many are going off roomers , & do not know how to make , even worse is testing for quality can be even farther beyond the " home brewer " = can be the best or worst fuel , just like back yard mechanics .

John Faughn

Making fuel is a deep subject , you have what , a $50,000 truck , that took some time to make the money to buy , spend some time to keep from ruining it .
If all your info is just listening to what other individuals are saying , you need to spend 3 times as much reading to try and find the facts .

SOhappy

The B5 thing. Yes, it says B5 in the owner's manual, but Cummins later came back and authorized B20 for our trucks because the bio producers were following stricter standards. No offence intended.

ian515

all the bio diesel I have seen at pumps is more expensive, so are we talking about cummins allowing us to make B20 and use it? or are they saying that commercially made B20 is acceptable...if so, why would you want it? its more expensive (putting aside that its better for the environment)?

SOhappy

Good point. I guess your homebrew would have to meet the ASTM specs for Cummins to approve a B20 mix. Hardly likely.

If you're rollin' your own then you are your own warranty station.

hivoltage

From what I've read Cummins ok'd 20% for fleet and emergency trucks only. The way I understand it is our trucks are still only ok'd for 5%. I'm sure it a warranty thing because the warranty period is much shorter for fleet trucks so in turn Cummins isn't responsible for the length of time that they are for our trucks. I've read about guys running 100% in a common rail with no problems and I've read about 5% causing problems, I think it's a coin toss. I ran 5% a few times and my truck didn't like it so I won't use it again.

Haulin_in_Dixie

The government in Missouri started using B20 in all diesel vehicles. After a while Ford told that that they could not run it in the ambulances with the 6.0.

DBLR

The below is also from Cummins for Dodge trucks:

A maximum blend of 5% biodiesel (B5) is acceptable as long as the biodiesel mixture meets ASTM specification D-975, D-975 - grade S-15, and ASTM D6751. A biodiesel fuel blend that is higher than 5% is not acceptable without additional fuel processing because these higher percentage biodiesel blends contain excess amounts of moisture which exceed the water stripping capability of the on-engine final fuel filter. Should a higher percentage biodiesel fuels be used an auxiliary water stripping filter will be required.

A maximum blend of 20% biodiesel (B20) can be used by government, military, and commercial fleets who equip their vehicle(s) with an optional water separator, and adhere to the guidelines in the Department of Defense specification A-A-59693 (in addition to: ASTM specification D-975, D-975 - grade S-15 and ASTM D6751)