Fuel Pump Inlet/outlet

[jim miller]

I just installed my Lycoming fuel pump with cooling shroud and now not
sure which is the pressure outlet to carb. When looking from behind the
engine one port is on left, the small drain port in middle, another large
port on right. Which one is the fuel out to carb?

Thanks
Jim Miller

[CharlieWaffles]

On my YIO-540, the port on the left is the pressure port and the right port is the inlet port.

[jim miller]

Charlie
Thanks. After reading your post I was able to make out some markings on
the bottom of the pump to confirm mine is the same as yours.

Jim Miller