Frank,
Using the superseded numbers, I found the correct needle and seat in my inventory. It is a 5/16 and has the usual small orifice. I will measure it against the one for the remote tank motors. The only difference visible at a glance is that the needle has a groove and clip to hold it to the float arm.

I will post back when I have compared the by measuring.

So here are my findings. As you can see in the photo, both seats have a 5/16 thread, but the one for the gravity feed motors has a larger orifice. This makes sense. It must be that the 12Hp needs even more fuel and requires the 3/8 seat when it is gravity fed.

To bring this back to the original issue, how does this all affect up pump conversions? I have not looked through parts books yet to see what was contained in the factory conversion kit, but I doubt that the seat would had been replaced, which would starve the motor of tank fed.

---

Attachments:

Gale accessories book doesn’t show any carb parts with the fuel pump & tank kit