GrassStripFlyBoy Posted October 14, 2023 Report Share Posted October 14, 2023 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? Quote Link to comment Share on other sites More sharing options...
Tom Baker Posted October 14, 2023 Report Share Posted October 14, 2023 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. Quote Link to comment Share on other sites More sharing options...
GrassStripFlyBoy Posted October 14, 2023 Author Report Share Posted October 14, 2023 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? Quote Link to comment Share on other sites More sharing options...
Jacques Posted October 14, 2023 Report Share Posted October 14, 2023 here they are...the grey ones looks factory made while the blue were 'hand made' .040'' thick roughly ....***for sale Quote Link to comment Share on other sites More sharing options...
Tom Baker Posted October 15, 2023 Report Share Posted October 15, 2023 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. Quote Link to comment Share on other sites More sharing options...
GrassStripFlyBoy Posted October 15, 2023 Author Report Share Posted October 15, 2023 I'll inquire on OEM. And the gasket material I have appears to be as you're describing, asbestos free type. Quote Link to comment Share on other sites More sharing options...
procharger Posted October 15, 2023 Report Share Posted October 15, 2023 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. Quote Link to comment Share on other sites More sharing options...
Tom Baker Posted October 15, 2023 Report Share Posted October 15, 2023 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. Quote Link to comment Share on other sites More sharing options...
procharger Posted October 25, 2023 Report Share Posted October 25, 2023 It was my ctls Quote Link to comment Share on other sites More sharing options...
Roger Lee Posted October 26, 2023 Report Share Posted October 26, 2023 On 10/14/2023 at 7:18 AM, GrassStripFlyBoy said: 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? 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. Quote Link to comment Share on other sites More sharing options...
FlyingMonkey Posted October 26, 2023 Report Share Posted October 26, 2023 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. Quote Link to comment Share on other sites More sharing options...
Roger Lee Posted October 26, 2023 Report Share Posted October 26, 2023 You don't have to remove the bulkhead plate and gasket. You just have to address the leaking fitting and that can be done without removing everything. Plus don't get carried away with Hylomar. If you use too much and it squishes out it is not compatible with fuel and it can float around and get in places you don't want it. Use a little, but don't glob it on. Quote Link to comment Share on other sites More sharing options...
GrassStripFlyBoy Posted October 26, 2023 Author Report Share Posted October 26, 2023 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. Quote Link to comment Share on other sites More sharing options...
Roger Lee Posted October 26, 2023 Report Share Posted October 26, 2023 Hi Darrell, If you have any questions please give me a call. Quote Link to comment Share on other sites More sharing options...
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