Sealant, petrol proof, fuel tap leak

[ssray]

Looking for something to hopefully stop my cbr600 fuel tap leaking.
It's from the flange fitting, 22mm nut that compresses a ring in-between the tank and the tap.

I've replaced the oe oring with a new oe spec one, I've fitted a new tap with a new oring.


Current thinking is a type of fuel proof sealant as a backup to the oring(1.3mm cross section)

[cliffords]

I cant make a link for some reason .
I used this on a fuel tank where a tap comes out with success .

Permatex 80008) Petrol/Fuel Resistant

[ssray]

cliffords said:

I cant make a link for some reason .
I used this on a fuel tank where a tap comes out with success .

Permatex 80008) Petrol/Fuel Resistant

Thanks, I did email them this morning, USA based
I'll give it a go
Ta Ray

[catso]

I have used Sic-tite (Ptfe paste) on motorbike fuel taps/fittings, seems to work OK.

[ssray]

Permatex replied
If you need to seal the threads consider Permatex High Performance Thread Sealant 56521.

If you need to seal the O Ring you could use Permatex Permashield Fuel Resistant Gasket Dressing and Flange Sealant 85420.

[richhead]

ive always had success with hermitite blue on fuel

[Belle427]

Wellseal or Stag jointing compound may be an option too.

[TarquinMX5]

Car Mechanics Feb 2026 has a 10-page article on various sealants / thread locks etc.. BondLoc white label WL77 is stated to be ethanol, unleaded etc. suitable up to 150 degrees; BondLoc B572 thread sealer is petrol resistant (ethanol not mentioned); Loctite 5400 for metal threads,fuel resistant.

Not used any of them.

Not sure about impact on O-rings, so a bit of research might be needed.