I'm replacing the Regina/AC fuel pump in a '90 740 wagon. Have the old unit w/sender out of the tank; the new pump comes UPS tomorrow. While I see the contacts must be unsoldered, it's not clear just how the pump detaches from the brackets and adjacent fittings, esp. the rubber square above, and what looks like a tiny master cyl. reservoir with double-domed cap, which may be some sort of pressure accumulator. Don't want to force anything and break it. All the info I've found on searching the board speaks to removing and replacing the whole unit, not disassembling the pump from the sender. Anybody know? Thanks!