Lycoming Fuel Pump Vent? Fitting part number?

I’m having a heck of a time finding a part number / spec for what I believe to be a vent fitting (or maybe pressure relief) on the back of a Lycoming fuel pump. The engine parts manual does not call out this fitting and I can’t seem to find it called out anywhere except for a Zenith build manual but the part number listed does not ping online anywhere or in their store.

This is the square fitting on the back of the fuel pump that has a 1/8” hose attached to it running to the belly of plane just past the cowling exit.

Thx!

This maybe?

02A21376

For some reason the image doesn't show but it comes up on ACS and various other sites and in the manual for the 540.

Maybe this?

RV-4 Fuel Pump Overflow Fitting (F OVERFLOW PLUG 1/8”)

https://shop.vansaircraft.com/cgi-b...128-9&browse=engines&product=overflow-fitting

10builder said:

RV-4 Fuel Pump Overflow Fitting (F OVERFLOW PLUG 1/8”)

https://shop.vansaircraft.com/cgi-b...128-9&browse=engines&product=overflow-fitting

Click to expand...

That is it! Makes sense that is a unique part based on The failure mode but I’m confident Now that once I get it out I can just resolder and reinstall.

Thx!

AN842-4D can be used, or---just use a AN822-4D and a hose end to attach to whatever discharge tube you are using.

Tom