Thread sealant?

[Jabamusic]

Am planning on replacing my fuel water separator to a Racor and was wondering if thread sealant is required on the new barbs/ Hose connectors?
Any thoughts?
Many thanks

 

[Cockaigne]

It's well over ten years since I fitted a Racor fuel filter and new copper fuel lines. I didn't use any sealant and it has never leaked. Compression fittings and hose connections in good condition don't need sealants.

 

[macd]

Am planning on replacing my fuel water separator to a Racor and was wondering if thread sealant is required on the new barbs/ Hose connectors?

Do you mean on the threads of the barb fitting? No form of sealant should be required on the barb-to-hose seal. However, it's better to use the correct type of hose clamp rather than a worm-drive (aka 'Jubilee'-type) clamp, such as this: https://www.ebay.co.uk/itm/MIKALOR-...-WATER-CLAMP-DIESEL-JCS-JUBLIEE-/222500358544

Note that such clamps have a smaller range of adjustment than worm-drive clamps and will need specc'ing to the particular application.

 

[RichardS]

It's a few years since I replaced one of my 500FGs but I recall that the inlet and outlet ports were 3/4 - 16 UNF. However, I don't recall any o-rings or gaskets so I'm thinking that they were taper fittings and I would have used PTFE tape rather than any sealants.

Getting the correct fittings to go from the UNF ports down to fuel barbs was a bit of a pain but Hyphose sorted me out.

If you need a definitive answer come back and I'll check what I actually bought from them.

Richard

 

[Jabamusic]

The threads, not the barb to hose side.
I was thinking PTFE but was worried about the effect of diesel on it?!

 

[RichardS]

The threads, not the barb to hose side.
I was thinking PTFE but was worried about the effect of diesel on it?!

No problem. PTFE tape is fine for diesel fittings.

Richard

 

[stevd]

I used a bit of hylomar blue which worked sealing the treads of my CAV filter. Its quite cheap for a small tube too.

 

[Poey50]

I used a bit of hylomar blue which worked sealing the treads of my CAV filter. Its quite cheap for a small tube too.

+1

 

[superheat6k]

Loctite 577

Nothing else to say really - but also works on reused O rings and gaskets, and doesn't harden off so can be undone later.