Thread stripped on fuel bleeder

[Brian Cox]

inserted a helicoil into fuel filter chamber for bleeder ,how to stop fuel seepage at bolt, will ptfe tape do the job?

[Billy26F5]

The bolt should have a fibre washer to seal it, if you can't tighten it enough to get a seal you should try some rubber before you use PTFE as it tends to be messy, and the one thing the injector pump will not tolerate is dirt.
Sandy

[MikesDexta]

I wouldn't use ptfe anywhere near diesel. Mine has a copper washer the same as on the injectors and doesn't leak even after several bleeds after work on the fuel system.

Mike

[Brian Cox]

thanks very much will try.

[Brian Cox]

copper washers ordered today

[Bluebilly]

PTFE was originally designed as a thread lubricant, and not for sealing. The fact that it sometimes seals was just a bonus. I'd use it as a last resort for sealing threaded parts.

[Brian Cox]

Thanks Billy, I,ve used it before to good effect

[Mervyn Spencer]

Brian, I had a similar problem with my bleed bolt on the fuel filter. The reason was that the surface had a bit of a burr, so we filed it down to achieve a smooth surface. Yes and a new alumnium/copper washer and that was the end of my leak.
Good luck Mervyn.

[Brian Cox]

thanks all, mine is ok now

[Brian Cox]

copper washer did the job

[oehrick]

Only just noticed this Brian, to avoid having to use too much torque on the bolt, heat the copper washer to red heat, hold it there for 10 seconds or so then drop into cold water, this will anneal i.e. soften it so it will conform and seal with less torque, always good practice if re using Cu washers and increasingly seems to be needed on new ones which appear to be supplied harder than they used to be !

[Brian Cox]

thanks Oerick, but it's working fine