Fuel tap sealing

[veg]

As above I’ve a tz fuel tap (new) fitted to a new tank. I’ve noticed a yellowing of the paint and there is a slight dribble of fuel. I used a gasket etc I’ve removed the tap cleaned the tank out I’m trying to remove the slight discolouration using t-cut and polish.
Would you use a silicon sealant on the tap? Or what would you recommend?
Cheers V

[crogthomas]

Silicone sealant is not petrol resistant, so don't use that.

I recall that blue hylomar is petrol resistant, but there are probably others.

What sort of gasket is on the tap, paper or a O-ring?

[midlifecrisisrd]

Does the paint go under the tap 😬

Steve

[veg]

Yes Steve it does I know. I’ll look at the tap shortly can’t remember which seal it is. Did wonder about marking off the tap area, then flattening back and lacquer the area.

[veg]

This is the tap with an o-ring.

[midlifecrisisrd]

May be leeching through the paint then, I've had the paint lift under the tap before

Anything other than old school two pack will eventually give in if in direct contact with fuel

Steve

[veg]

Thought it might be. I’ll cut it back, refit and see. Did wonder if it was worth using sealant as well as the o-ring

[urbantangleweed]

If paint is on the tank under the tap sealing area, I fit the tap, mark round it and Dremmel the paint off with a Dremel brass wire brush near to that mark to reveal bare metal. Ideally you want to clean it back to just outside the oval "O" ring area. The Dremel brass wire brushes are expensive compared to the cheap Chinese ones, but they wear down rather than fling the bristles out everywhere!

It should then seal on the oval "O" ring with just a smear of grease, and the grease should help prevent the bare metal from corroding but if in doubt, there's a product called "Seal All" which is supposed to be fuel resistant which might be helpful, I've not used it myself though.

[midlifecrisisrd]

As above

I mark of the area covered by the tap, remove the paint then a thin smear of red grease. More to protect any unpainted area outwith the seal

Steve

[veg]

Thanks both, that’s what I’ll do.

[Tobyjugs]

Good advice from steve and urban. Also use a tiny dab of loctite thread sealant on the screws. Just make sure you degrease the threads first.

[andy748]

Also make sure you use the genuine sealing washers on the screws, or they'll leak from there. Andy.

[4l04ever]

I have some alternative o-rings which are slightly thicker than standard. If you need one, let me know :-)

[JonW]

Jan 29, 2024 19:03:50 GMT 1 andy748 said:

Also make sure you use the genuine sealing washers on the screws, or they'll leak from there. Andy.

yes, as Andy says, make sure you use the sealing washers on the screws.

[billbott]

I had the same bother when I first put mine together in 2005-ish
Just couldn’t stop it dripping, so I made a ‘full face’ gasket from some viton rubber sheet (about 3mm thick) which was a snug fit around both the inner filter tube and the two mounting holes and that cured it.
Not pretty but cant be seen when its on and its lasted since then.

[4l04ever]

I use copper washer for sealing the tap bolts.

[LC_BOTT]

I normally remove the paint and use Yamabond. Then a smear of grease around the tap just to stop any possible rusting. Also fibre washers as mentioned above.