UMA Mechanical Fuel Pressure Gage Install

I'm installing a new fuel pressure gage. Is some type of sealant/thread locker called for on the fuel line that threads into the back of the instrument?

Seems like just screwing in the fuel pressure input line into the back of the instrument without securing it some way is asking for vibrations to maybe cause loosening over time, and leaking fuel into the cockpit behind the instrument panel.

I really don't like messing with fuel lines, and I've never done this job before. Looks like a simple (ha ha) remove-and-replace, but the fuel line input is a thinker for me. Any suggestions will be appreciated.

RC

Here you go..... https://vansairforce.net/community/showpost.php?p=1640389&postcount=29

The installation diagram I see shows 1/8 NPT, so the fitting will require sealant on the threads, and must be correctly torqued. After that, they don’t lose tightness.

Waiex-guy said:

The installation diagram I see shows 1/8 NPT, so the fitting will require sealant on the threads, and must be correctly torqued. After that, they don’t lose tightness.

Click to expand...

Ok good. Thanks. I can't find any installation instructions.

Now, that leads to two questions: what sealant (EZ Lube, Loctite 567, that Ace Hardware stuff)? what torque?

Waiex-guy said:

The installation diagram I see shows 1/8 NPT, so the fitting will require sealant on the threads, and must be correctly torqued. After that, they don’t lose tightness.

Click to expand...

This is my gauge. Maybe I don't understand NPT numbers, but the holes look bigger than 1/8, not that that matters per se. Sealant and torque is the main thing.

VF84Sluggo said:

This is my gauge. Maybe I don't understand NPT numbers, but the holes look bigger than 1/8, not that that matters per se. Sealant and torque is the main thing.

Click to expand...

NPT threads are based on the ID of the line. A 1/8" NPT OD is approximately 3/8" Dia.

I see. Very good, thanks much.