It's funny how the throttle body is such a universally misadjusted part. The setting makes perfect sense, but it's easier to just adjust idle without bothering the rest of the system--which is often what happens.

Glad to hear you got your A/C straightened out as well. I should've thought of the connections, but I usually get trapped by looking for big problems when in fact the small ones slip under radar.

From what you described, it sounds as if the in-tank pump is either weak or there is a break/crack in the in-tank lines. If you have a few minutes to spend, you can jump the in-tank pump and see if it causes the noise, or if the external one is making it. The in-tank assembly might be at fault--either the line or the pump.

Basically, what you said it was.
--
Chris Herbst
1992 745, 68k

And others:
93 944, 150k
90 245, 110k
88 744, 160k
87 245, 185k