Which side of the Flow Equalisation Valve does the CWT feed into the Crossfeed Manifold - or do the OVRD/JETT pumps feed into the manifold individually either side of the valve (in which case the panel schematic is misleading)?
Correct, Left Ovrd/Jett pump supplies to left side of flow equalisation valve and the R/H Ovrd/Jett pump discharges to the right side.
Not sure how this makes the panel schematic misleading, as on all the 747's i've worked on, the flow equalisation valve isn't even depicted on the P4 panel.
Dutch74 said;
I knew about the flow equalization valve but it still doesn't explain advantages/disadvantages of keeping #2 xfeed vs. #1 and/or #4 xfeed after fuel is balanced between all tanks.
Well, it does actually explain a potential disadvantage of having more than one crossfeed open.
Jumbo Driver's procedures would back this up.
I do recall that we left one Crossfeed Valve open (#1 or #4) when "Tank to Engine" in order to pressurise the Crossfeed Manifold.