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.

Joe Betty examined reactions between oils and metals