Well, I gave it up a few months ago but seems the damage is done. I'm sure that others have used it without problem but he said it's not a good idea and it's a common cause of seal failures.
We went inside and looked up the price of a new pump - a mere €1500! I'll take two mate. Luckily I bought a re-con one which is lying in Uk unfortunately because of high postage to here. So I drip until I can get it over.
Just wanted to let people know the Bosch opinion of bio fuels for the BX type pumps. Ok, it's an old pump etc. but he had no doubt that I had assisted its decline ( as well as rainforest clearance etc.)
Still, mustn't grumble