Some of the hoses, metals and rubber seals can be affected by Bio-diesel
http://www.pcmarinesurveys.com/biodi...20surveyor.htm
Sure, this is marine info, but the engines are pretty much the same
Quote:
| Biodiesel has many beneficial properties and is definetly worth investigating however, it may have some significant drawbacks. Since most information on the product has been presented by organizations promoting it, one has to take a look at the other side of the coin. (1) The principal issue is that biodiesel is a very aggressive solvent. Even USCG Type-A fuel hose is not completely immune. Some metals are also not recommended including copper alloys [common brass valves and fittings?] Any spilled fuel will rapidly attack paint on engines, bilges, etc. Rubber engine mounts will be affected. On deck it will attack paint and bedding compounds { gelcoat? acrylic hatches? boat shoe soles?]. It appears that it may also affect fiberglass tanks if they are not specially coated. It certainly will dissolve and mobilize old scum and deposits in the fuel system. (2) Newer engines with all Viton seals and gaskets can probably use it. Older engines are probably questionable. If the fuel causes any problem, the engine manufacturer may not consider it a warranty issue - it is your problem. (3) Biodiesel is hygroscopic (absorbs water) and perhaps more subject to bacterial action. Biodegradability in the environment is one of its strong points but not good if it happens in your tank. There is not much information on long term storage in a typical pleasure boat environment, i.e. fuel sitting in a hot, humid tank for months and sometimes years. Commercial users and probably most automobiles do not have this problem. |