Bill3558 Posted April 10, 2023 Report Share Posted April 10, 2023 The fuel drain on the bottom of the header tank is always wet. Sometimes with a drop of fuel hanging from it. I’ve replaced the valve but that didn’t fix it. Here is a pic of what I’m seeing after draining the header tank. It appears the female threaded fitting is epoxied in and I fear that may be what’s leaking. Any thoughts or solutions appreciated. Quote Link to comment Share on other sites More sharing options...
Bill3558 Posted April 10, 2023 Author Report Share Posted April 10, 2023 Better pic Quote Link to comment Share on other sites More sharing options...
Tom Baker Posted April 10, 2023 Report Share Posted April 10, 2023 Those drain valves tend to hold some fuel in them for quite a while after draining fuel. Make sure it is absolutely dry, then check it a day later. Also check around where the valve screws in for wetness. Touch the edge of a tissue around where the threads are. The tissue will wick small amounts of fuel if there is a leak. Quote Link to comment Share on other sites More sharing options...
Tip Posted April 11, 2023 Report Share Posted April 11, 2023 Hey Bill. My friend, Ron, had the same issue with his SI. Here’s the problem, the boss fitting that the valve threads into is epoxied to the bottom of the tank. The hole that is drilled into the bottom of the tank is too small and the valve bottoms out on the tank bottom and isn’t tight in the threads. Ron took the valve out and drilled a bigger hole so that the valve is actually up in the tank a bit. He put grease on his drill bit to try to capture the filings. Quote Link to comment Share on other sites More sharing options...
procharger Posted April 11, 2023 Report Share Posted April 11, 2023 Mine was leaking also I custom fit a washer then put marine epoxy around fitting and on washer not much epoxy on washer and a little around hole and it has stopped leaking. Quote Link to comment Share on other sites More sharing options...
Tom Baker Posted April 11, 2023 Report Share Posted April 11, 2023 28 minutes ago, procharger said: Mine was leaking also I custom fit a washer then put marine epoxy around fitting and on washer not much epoxy on washer and a little around hole and it has stopped leaking. I thought yours was a regular CTLS, and not injected. Quote Link to comment Share on other sites More sharing options...
Roger Lee Posted April 11, 2023 Report Share Posted April 11, 2023 Apply some Hylomar Blue on the threads and put it back in. It won't leak. I use the Hylomar on leaks and have never been disappointed and it never leaked again. FD uses it on the fuel sight tube bulkhead gasket. Quote Link to comment Share on other sites More sharing options...
procharger Posted April 11, 2023 Report Share Posted April 11, 2023 It is LS that's how I fixed my leak. Also have SW. Quote Link to comment Share on other sites More sharing options...
Tom Baker Posted April 11, 2023 Report Share Posted April 11, 2023 9 minutes ago, procharger said: It is LS that's how I fixed my leak. Also have SW. They are talking about the drain valve on the header tank on a fuel injected airplane. Quote Link to comment Share on other sites More sharing options...
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