Interesting timing for this question. I saw this on eBay, and wondered if it was an EFI fuel pump (that would fit my '75 SportWagon with EFI) or a normal low pressure carb-type unit:
http://cgi.ebay.com/ebaymotors/ws/eB...EBWA%3AIT&rd=1
The application table seems to have it fitting most modern cars after 1982, and many cars (including BMW's) that I know to be fuel injected, so it might be the right one. I have e-mailed the seller and asked if it works for the '75 Opel with EFI, and what the specs are (rate and pressure). Stay tuned...