Does the injector pump have any natural rubber parts that might erode through the use of b100.

Some say yes, some say no.

There are seals and hoses in our 80s vintage diesels that are susceptible to biodiesel rot. For proof, do a couple of Google searches (like this, or this.)

As to which seals and hoses to replace, ask your dealer/favorite supplier about a "Teflon replacement kit." You also might want to look into Viton replacement fuel lines.