Even though biodiesel has been available in Oregon for several years, I have avoided it for as long as I could. When I contacted Cummins they said we can run up to B20 ok. B2 (which is 2%) biodiesel became mandatory for the whole state of Oregon on Oct 1 2009. According to the Biodiesel Magazine 150 bills were introduced in 36 states for various uses this year. There are several other states going to B2 to B5 this year. The first problem, even 2% biodiesel acts as excellent natural solvent, and any deposits in the fuel tank will be cleaned out and end up in your fuel filters.
When I bought my Alpine in Jan 2010 and brought into Oregon, it had 12,000 miles and I am sure it never biodiesel in it. I did install a Cummins fuel filter gauge (part #3892577S) on a tee on the out fuel line on the suction filter. (I don't how to post a picture of it on this website) In 1200 miles using biodiesel I have changed 2 suction filters and is 1/2 way through the third filter on the gauge. I changed my pressure filter once. When I had the same gauge on my 2000 Alpine for 10 years and I never once had a problem plugging fuel filters.
The next problem is biodiesel is rich food source for microbes (bugs) that produce filter clogging sludge. Also condensation is more of problem with with biodiesel and they recommend keeping tank topped off. If is stored more than 6 months you should add a stabilizer. In cold climates biodiesel will gel and you may have use an antigel. Also biodiesel can damage paint and plastics and you should clean it off right away. Also B2 will reduce your mileage some.
I know this isn't isn't an Alpine problem, and that it is already coming to more states. All I can say is when you first start using biodiesel you should change filters more frequently and carry spare filters because of the biodiesel solvent properties.
For over 40 years I have diesel trucks, equipment and motorhomes and never had filter problem or used additives. To me, times have changed and I started using an additive now. I am not making any recommendations on what to use. I talked to a local distributor and he recommended to me Diesel Clean (www.powerservice.com
). He said it is readily available many stores including truck stops. I am sure there is other good products available.