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Good morning Steve, I have seen Coupes with the threaded ends and wanted to do that to my fuel hoses. I was unable to find approval for such a change and also unable to find the restrictor fitting with threaded ends for the fule pump. Does anyone on site know if there is a 337 or STC for using the better steel braided fuel hoses with the threaded ends, and if so, where did you get the restrictor fitting? I use 2 clamps on the ends of all the hoses but still have concerns about a hose coming off in flight, and the possible engine fire that would result. Thanks Alaska Pete ---------------------------- From: [EMAIL PROTECTED] To: ercoupe tech <[email protected]> Reply-To: [EMAIL PROTECTED] Subject: [COUPERS-TECH] more on fuel hoses OK. I am going to send this only to the tech list, since we have been asked to refrain from "double posting". Since I started the fuel hose thread I think I should add to it as well. I was wondering how many people are using fuel and oil hoses with metal pipe-thread ends, and how many are still using the push on type, secured by hose clamps. It seems to me that changing to the threaded ends means changing all my metal fuel line ends, which is real "pretzel" work. Thanks for the note about mil-h-6000 being changed to mil-dtl-6000. I think that is where the confusion came from. I was worried that the change, and the fact that it says "not recommended for fuel" was because of a material change in the hose. It appears that the note refers to the fact that most modern aircraft use "finished" hoses with fittings, and that is probably what most engineers would look for. The fact that the coupe was made with push-on ends probably leaves us in the minority. However, it property installed, and coated with fire-sleeves, I don't see why it wouldn't be just as safe. One problem with looking at other hoses is that the newer hoses are lighter and are acually a smaller diameter for the same hose. For instance the -6 hose is actually an I.D. of .32 rather than .37. It might make it difficult to push on the old fittings. The -8 hose is .41 ID and would probably work just as well and be lighter in the long run. The same may hold true with the -4 hoses for the fuel pump. You may have to go up one size to get it to fit the fittings. Steve Finkelman C-FIWR ========================================================================== ==== To leave this forum go to: http://ercoupers.com/lists.htm Search the archives on http://escribe.com/aviation/coupers-tech/
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