Fuel Line B Nut

Is the fuel line B nut supposed to be installed with lube like an NPT fitting?

Or does the B nut go on dry?

B nut

s10sakota said:

Is the fuel line B nut supposed to be installed with lube like an NPT fitting?

Or does the B nut go on dry?

Click to expand...

Dry, I think. Otherwise the torque value will be wrong.

s10sakota said:

Is the fuel line B nut supposed to be installed with lube like an NPT fitting?

Or does the B nut go on dry?

Click to expand...

Yes, dry, but you don't have to clean-it-with-acetone dry. I got goosey about the 3003 and deformation and torques and did quite a bit of testing. The 3003 will deform slightly with nominal torque, but the high limit as the rule would be too much.

All this is posted with pictures if you look. Here you go - read the entire thread - you will learn a lot about dry vs lubed joints and the results. http://www.vansairforce.com/community/showthread.php?t=123689&highlight=torque

Short version: dry and stick to middle of the torque specs. Definitely torque the joints.