I have a 1995 940 T which seems to have the same single-in-the-tank pump as an 850. I need to put in a new pump and am confused by the big, plastic looking end of the pump that sticks out of the tank. There is a metal clamp around it. Do I just remove the clamp and turn the giant knob by hitting it with a screw driver (like I would to remove the metal fastener from a 240-740 pre-pump)?

Thanks

Yes, you pretty much have the idea. Remove the monster hose clamp from around the large plastic ring. The ring will unscrew like a big jar of pickles. I have been known to cheat and just use a big ass screwdriver to lever the edge of the ring up. Slide your monster screwdriver in the hole and use the bottom edge of the hole as your leverage point, engage one of the ribs on the ring at about 3:00 and push down on the handle which will lever up on the ring. Continue to do this until it is loose enough that you can do it by hand. In the event that you need to leave it open for an extended period of time do yourself a favor and spin the ring back on as the threaded mouth that it goes on will expand just enough to make your life a nightmare.

Mark