Join Date: Feb 2009
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Here is what we know right now:
Highway #2 diesel fuels have been regulated for several years concerning sulfur content, with ultra low sulfur (>15ppm) being mandated. This sulfur level is supposed to have been adopted in full by last July for marine diesel #2at the dockside, but there may remain supplies until late 2010.
We are not aware of any issues facing small diesel fired marine furnaces of any brand as a result of current or future diesel sulfur levels. There is some improvement to the smell of lower sulfur diesel as a liquid, nothing appreciable in terms of exhaust smell, since correctly running furnaces should have no significant smoke or smell once they are up and running.
We do not see any reason to seek out highway fuel for your Wallas products any longer, since the marine fuel sulfur levels are now supposed to meet the ultra low standard that has been on highway for many years now. This should mean that smell concerns about the liquid fuel are no longer warranted.
Biodiesel content in highway fuels will vary from location to location. Highway fuels are typically limited to 10% biodiesel (AKA B10) and this number could go higher, depending on legislation. Marine fuels also vary in their biodiesel content from location to location with a limit around 10% currently, due in part to the limits allowed by diesel engine manufacturers.
While Wallas products are not intended for use with pure biodiesel, we know there are many in the field using the diesel/bio fuel hybrids showing up at the pumps and we can't associate any problems in our products as a result of diesel up to a B10 rating.
One of the key elements involved with using biofuels, both biodiesel and gasoline with ethanol is that these fuels do not tend to be as stable as pure diesel or pure gasoline. In gasoline, the ethanol component can convert to water over time and the bio component of biodiesel also will break down if unused. These characteristics can cause problems for diesel and gasoline engines respectively.
Whether old biodiesel at the B10 rating and below will cause problems for diesel boat furnaces and heaters remains to be seen, however we can't trace any of these problems into Wallas products so far. It is much more likely that old biodiesel might cause a problem for diesel engines, particularly modern ones with very high injection pressures.
The following fuels represent the only fuels we recommend for use in Wallas diesel products: #2 diesel, both on and off highway (includes marine), #1 diesel (home heating oil), kerosene, JP4 (kerosene turboprop aircraft fuel) and Klean Heat.
Doug at Scan
Distributor, Owner of Scan Marine Equipment North American Importer and Distributor for Wallas Marine Products