Ken:
Most likely the pump orientation will make a difference. Many SU fuel
pumps use flat brass disks that settle against a machined surface as a
valves. If the pump isn't oriented upright, the valves won't seat. I
don't know about the later SU pumps, but I've seen some after markets
which use a type of plastic reed valve. These may not be as susceptible
to orientation, but I would still install them with the discharge nipple
vertically.
Blake
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