Fuel pressure sensor

[Wingover]

Following a few recommendations here I now have the Omega fuel pressure transducer and the two fittings to go from the flare connection to the pipe thread.  While testing the connection I see some fuel bubbles/small leak between the threads.

What others are using as sealant for fuel fittings?

Here is a picture of the setup.

[PT20J]

Tapered pipe threads need a sealant. Armite LP-250 is the best thread sealant I’ve found, recommended by my A&P/IA, it won’t seize, gall or leak. Most retailers only seem to stock 1 or 5 lb cans. I bought a small tube (maybe a couple of ounces) from McMaster-Carr, but I had to call them as it didn’t show up in their online catalog. 

[Wingover]

34 minutes ago, PT20J said:

Tapered pipe threads need a sealant. Armite LP-250 is the best thread sealant I’ve found, recommended by my A&P/IA, it won’t seize, gall or leak. Most retailers only seem to stock 1 or 5 lb cans. I bought a small tube (maybe a couple of ounces) from McMaster-Carr, but I had to call them as it didn’t show up in their online catalog. 

Many thanks!  I hope I can find it in Europe. Do need to wait for it to dry before testing the pressure with the electric pump?

[PT20J]

42 minutes ago, Wingover said:

Many thanks!  I hope I can find it in Europe. Do need to wait for it to dry before testing the pressure with the electric pump?

No, it’s really powdered lead in a solvent. The soft lead provides lubrication allowing a the parts to be torqued a bit tighter without galling, and it also seals the gaps in the valleys of the threads, and it’s impervious to gas. But it’s lead, so it’s toxic, so don’t eat it .

[Wingover]

41 minutes ago, PT20J said:

No, it’s really powdered lead in a solvent. The soft lead provides lubrication allowing a the parts to be torqued a bit tighter without galling, and it also seals the gaps in the valleys of the threads, and it’s impervious to gas. But it’s lead, so it’s toxic, so don’t eat it .

Doesn't seem to be available in Europe   Do you know if there is a Loctite alternative?

Edited April 9 by Wingover

[Wingover]

Is the McMaster-Carr part number 1280K52 ?

[PT20J]

41 minutes ago, Wingover said:

Is the McMaster-Carr part number 1280K52 ?

I don't recall, but that looks right from the catalog page. 

[Fly Boomer]

5 hours ago, PT20J said:

Tapered pipe threads need a sealant. Armite LP-250 is the best thread sealant I’ve found, recommended by my A&P/IA, it won’t seize, gall or leak. Most retailers only seem to stock 1 or 5 lb cans. I bought a small tube (maybe a couple of ounces) from McMaster-Carr, but I had to call them as it didn’t show up in their online catalog. 

I see it online both with and without filler -- which do you use?

[PT20J]

4 hours ago, Fly Boomer said:

I see it online both with and without filler -- which do you use?

I've always used the one without filler.