At 02:10 AM 5/20/2012, neil n wrote:
>A " T " would be required at inlet, there would be 2 more hose clamps than
>with the WBX part, positioning it might be a problem, but other than that,
>will the part work correctly?

I haven't done it, Neil, but I don't see any likely issues.  The AFC
fuel pump delivery rate is the same, injection pressures same, the
venting rate back to the tank should be the same or less.  The AFC
system appears to feed at one end of the system and vent at the
other; the later ones feed at both ends and vent in the middle (or to
say another way, feed the two sides of the engine in parallel) which
gives both sides the same inlet fuel temperature.  Doing it that way
it becomes more convenient to have two input nipples on the
regulator.  The only possible (not likely) issue I see with using a
tee is turbulence/noise/restriction where the two flows are
constricted, meet, and abruptly turn 90 degrees at the tee instead of
feeding into the less constricted turning point inside the
regulator.  Since the fuel pump is a positive-displacement type with
excess capacity it's not going to cause *it* a problem, and I find it
hard to believe it would constrict flow enough to cause a problem
with pressure regulation.  If you're anal you could test this by
installing a tee in place of the existing regulator and measuring
pressure at the test tee (not the one you installed) while running
the pump with a jumper.  If you wanted to be even more persnickety
you could then measure the same pressure downstream (toward the tank)
of the new tee and subtract it from the other reading to get the true
max pressure drop across the tee itself at max flow
conditions.   We're talking about half a liter per minute flow rates
here at 35 psi net pressure drop in the system and gasoline's not
very viscous, so I really don't see a problem.  The tee would have to
be fuel and temperature safe at pressure, of course, and if the
return line somehow got pinched it might see over 100 psi.  A metal
tee would take care of any worries there.

Yours,
David