When I was last teaching diesel mechanics, back at the end of 2009, both Yanmar and Cummins discouraged the use of biodiesel in their engines. I believe Yanmar authorized use of B5 and Cummins was B10, but it could be the other way around. Hey, I'm getting older and I sometimes forget stuff.
I recall one of the service bulletins mentioned concerns about the lubricity of some of the oils resulting from the process of making the biodiesel, but the Stanadyne additive both manufacturers recommended for older engines after the introduction of Ultra Low Sulphur Diesel should take care of that. The major concern was with longer term fuel storage - and with the fuel consumption rates in our boats any fuel in the tank is longer term storage. As mentioned by someone earlier, the critters in the tank live in the water at the bottom and eat the diesel fuel. They eat the diesel, but they really seem to thrive on the biodiesel, and the growth of algae was much more of a problem with biodiesel. I've used B5 in my boat from time to time, but I keep Biobor algaecide in the tank, and have since the new tank was installed in 2010. Rick Brass Washington, NC From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Martin DeYoung via CnC-List Sent: Monday, August 17, 2015 12:19 AM To: cnc-list@cnc-list.com Cc: Martin DeYoung <mdeyo...@deyoungmfg.com> Subject: Re: Stus-List jelly substance on filters I once had a similar experience on Calypso a few years back when I used a tank of 20% biodiesel. I switched back and have not seen it since. My guess is the biodiesel was not properly formulated and some of the non-dinosaur fats separated out.
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