Biodiesel

can dissolve neoprene rubber. Make sure that hoses and gaskets are made from another material like Viton.

Vegetable oil fuel reactions

There have been recorded experiences of galvanic reactions created when used vegetable oils have reacted with metallic fuel system parts.

Notably some metal fuel tanks appear to have a coatings that have reacted with used vegetable oil.

Morgan H Crawford reports such issues.

Feasibility and Emissions of Compression Ignition Engines Fueled with Waste Vegetable Oil Morgan H Crawford 2003

Joe Betty examined reactions between oils and metals

Vegetable Oil as a fuel

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National Biodiesel Board - Material Compatibility of Biodiesel

Frybrid - Table of Material Compatibility for vegetable oil, biodiesel and diesel

Cole Parmer - Chemical Compatibility Biodiesel Material Compatibility