Bertrand Daoust

Guys,

Is there anything that I can put on gas line threaded connections on the regulator, dampners and fuel rails to prevent leaking.

I always installed those without anything but was wondering if some of you put something there.

Never had problem but everything is apart right now so it would be the right time to put something if it is better to do so.

Thanks in advance.

linderpat

on mine, I use a little of the silver anti seize on the threads. It is most important to not overtighten, as that can damage the connection points. The fittings have a sort of ball and cup, and if made too tight, can distort the ball side, leading to leaks and failure.

MainePorsche

Greg Brown recommends Loctite 574 for the flange connections at the ends of the fuel rails. It works incredibly well there as expected. I would use it on the threaded connectors here ONLY if I had a dribble, but then again, I would be very cautious about doing such a thing when at comes to gasoline.
Let's see what the Masters have to say.

MainePorsche

I've used a touch of silver too on Greg's threaded connections. I've never had a leak there. Curious to hear regarding 574 there.

Rob Edwards

https://rennlist.com/forums/928-foru...ail-issue.html

Posts 7 and 9.

MainePorsche

^ I've seen that before.
That 574 is really something. If you read my thread that Rob posted you'll see. I had a micro scratch on the ball of the fuel rail and sanded it down with 1200 grit under magnification - still leaked. Greg said 574 and it's been fine ever since.

Add: So I guess it would help if you had a micro-defect that leaked through the threads. Certainly wouldn't act as an anti-seize if you had to get them off.

Bertrand Daoust

Thanks guys.

I never had problem so far but would you recommend using 574 as a preventive way or only if leaking?

I don't want any problem when removing in the future too.

Thanks again.
All comments appreciated.

MainePorsche

Bertrand,
I'd hold off on using it on the threaded lines - these normally don't leak - would use it if you discovered you had a small dribble - but this is unlikely.
I would always use it on the ball/cup flange.

GregBBRD

^^^^^^100%

The problem with any sealant used on fuel lines is the potential for a small portion to get into the system, plugging something up. I'd only use a sealant, on the sealing faces, if I had a minor imperfection and couldn't get it to seal, without any sealant. And even then, I'd use a very thin layer. Loctite 574 is perfect, for this application.

Can't go wrong with some sort of anti-seize on the threads.....even a drop of oil is better than nothing.

MainePorsche

You know you're a 928 owner if Greg puts this in his post right after yours.

Here's an oldie, but goodie.

https://rennlist.com/forums/9551339-post1.html