Fuel tank port

[GrassStripFlyBoy]

Preparing for wing pull & sight tube change.  Noticed threads on fuel line bulkhead fitting (in the small plate / wing tank access panel) shows some slight sign of fuel weeping.  What's the situation, appears I'd need to remove the pattern of fasteners and pull the whole bulkhead, redo fuel fitting with some sealant on threads, then reinstall?

[Tom Baker]

While the tank is empty you can try removing the nut and applying Hylomar to the threaded area and tightening the nut back down. Otherwise the bulkhead needs to come off. Either buy a gasket from Flight Design, and they are pricey for what it is, or make one yourself. Hylomar on both sides of the gasket when it goes back together. Start your torque on the at around 80 in/lb, and go up from there if needed. If you have time you can cap the outlet and add fuel to the tank and inspect the next morning for leaks. There is nothing worse than having a fuel drip the next morning, and having to pull the wings and start all over.

[GrassStripFlyBoy]

14 minutes ago, Tom Baker said:

or make one yourself

Much appreciate the detail, and yes I won't be in a rush so will give it time before reinstalling wing.  I have 1/32" thick cut*a*gasket material from the old tractor needs and what not, is that thick enough?  Never seeing this gasket, what's the construction type?

[Jacques]

here they are...the grey ones looks factory made while the blue were 'hand made'     .040'' thick roughly

....***for sale

[Tom Baker]

The OEM gasket is .030. Make sure you use a gasket that is suitable for fuel. I just replaced some gaskets on a fuel tank sending unit on a motor glider because they were weeping. It was the brown fiber untreated material. A gasket material with synthetic fibers bound with nitrile rubber would be best, like the blue one in Jacques' picture. 

[GrassStripFlyBoy]

I'll inquire on OEM.  And the gasket material I have appears to be as you're describing, asbestos free type.

[procharger]

I had the fitting leaking I used marine grade epoxy which is gas resistant and it

worked on threads and around fitting behind washer no more leaks.

[Tom Baker]

4 hours ago, procharger said:

I had the fitting leaking I used marine grade epoxy which is gas resistant and it

worked on threads and around fitting behind washer no more leaks.

Marine epoxy is what was recommended for the CTLS where the fitting is in the composite. For the CTSW Hylomar will work better.

[procharger]

It was my  ctls

[FlyingMonkey]

11 hours ago, Roger Lee said:

You can easily seal that fitting in a few minutes without removing the bulkhead. I've done many and it only took minutes and I used Hylomar to do it and they never leak again.

Roger when you do this do you replace the gasket or just smear it with Hylomar?

I used Hylomar on the drain valve of my gascolator bowl, it's really good stuff.

[GrassStripFlyBoy]

Hylomar arrived.  Ordered gasket this week, $20 + $5 shipping, figured I'd have that on hand if I need to fully redo things, but will start with just the fitting.  It's not leaking any significant amount, more so looks like it weeps a tiny bit on threads. 

[morgan]

On 10/16/2023 at 3:41 AM, Tom Baker said:

Marine epoxy is what was recommended for the CTLS where the fitting is in the composite. For the CTSW Hylomar will work better.

For sealing fuel tank fittings in composite materials, marine epoxy is a good choice for the CTLS because it creates a strong, fuel-resistant bond. However, for the CTSW, Hylomar works better since it stays flexible and won’t crack over time. Hylomar also resists fuel and oil, making it a good option when some movement is expected. Using the right sealant for each model helps prevent leaks and keeps the fuel tank marine system in good shape.

[GlennM]

6 hours ago, morgan said:

For sealing fuel tank fittings in composite materials, marine epoxy is a good choice for the CTLS because it creates a strong, fuel-resistant bond. However, for the CTSW, Hylomar works better since it stays flexible and won’t crack over time. Hylomar also resists fuel and oil, making it a good option when some movement is expected. Using the right sealant for each model helps prevent leaks and keeps the fuel tank marine system in good shape.

Thank you, AI

[flygpagen]

On 10/16/2023 at 12:41 AM, Tom Baker said:

Marine epoxy is what was recommended for the CTLS where the fitting is in the composite. For the CTSW Hylomar will work better.

I have a CT SupraLight (CTSL) that I am doing replacement of gaskets on. Hylomar Blue is a bit difficult to get where I live so I bought a tube of Reinzosil instead. Is it equal or should I just order online?

[Tom Baker]

1 hour ago, flygpagen said:

I have a CT SupraLight (CTSL) that I am doing replacement of gaskets on. Hylomar Blue is a bit difficult to get where I live so I bought a tube of Reinzosil instead. Is it equal or should I just order online?

I don't know about that sealant, but it says it is a silicone, and I have never had any luck using silicone based sealants with fuel. I have used this in place of Hylomar. The packaging says it is orange, but what I have bought has been blue.

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