Fuel pump fittings

[kgrasse]

I need help plumbing the Lycoming mechanical fuel pump. My questions are, #1, how are the fittings tightened down (not the fuel line)? Tighten the fittings and then torque the jam nut/O ring, or torque on both? #2, before I order the wrong part, what size is the fitting that attaches to the overboard vent?

[RV6_flyer]

Screw the fitting in to get the angle the hose attaches correctly oriented then tighten the jam nut with the o-ring.

[lr172]

You can use a wrench to hold the fitting in position while you tighten the nut, if desired.

The overflow is 1/8" NPT, so fitting of your choice.

Larry

[kgrasse]

Thank you!