Always use the engine manufacturers recommended gaskets, there is no deviation from this whatsoever when using jatropha based biodiesel or any other source of vegetable oil or animal fats biodiesel.

Do make sure that with older vehicles, pre 1996, to check whether there may be rubber based materials used in joining the filler tubes and/or the fuel line connections, and possibly some fuel pump diaphragms because biodiesel will deteriorate these. If this is found to be the case simply change them for the synthetic materials used in modern vehicles. For trouble free running, always use biodiesel made to international standards as described in my books .

Merv Rees.