welcome to the forum Hans ("hands"), as to "diesel purge":

I think that several vendors sell a "diesel purge."

Based on what I have seen and read, Diesel Giant is a really good source, seems to be well respected, etc...

Here is a post that I just pulled up where Diesel Giant posts re diesel purge:

http://www.peachparts.com/shopforum/showthread.php?t=152015

I would look to Diesel Giant first, just based on what I have read, gluck.