Vic Posted July 11, 2021 Report Share Posted July 11, 2021 Hey guys. Went/tried to go flying today and found fuel on my floor when I opened up the fuel valve. After some brief investigation I found fuel leaking out between the black linkage arm and metal valve body. Is this a simple oring replacement or will I need to order a whole new valve assembly? Is something loose that I could have tightened on the black link arm. Fuel only pours out when I OPEN the valve. It stops once I close it. Seems like the best option is replacement but maybe someone else knows more about these valves. Quote Link to comment Share on other sites More sharing options...
Roger Lee Posted July 11, 2021 Report Share Posted July 11, 2021 If your sure it isn't the hose then the valve needs to be replaced. Make sure when you re-install the hose you DO NOT over tighten the clamp. Quote Link to comment Share on other sites More sharing options...
FlyingMonkey Posted July 11, 2021 Report Share Posted July 11, 2021 If it leaks on opening, it has to be either the valve itself or the hose downstream from the valve. The valve seems much more likely. As critical as this is to safety, I'd probably replace the valve and closely inspect the hoses attaching to it and replace them if they show any significant wear. If you have enough hose, clip off an inch or two from the end of each hose so you get a good fresh interface between the hose and the valve. On a side note, I'd be curious what FD charges for the valve. I'm guessing it's not as cheap as we'd all like it to be. Quote Link to comment Share on other sites More sharing options...
Tom Baker Posted July 11, 2021 Report Share Posted July 11, 2021 Leaking valves are becoming a bigger issue as the fleet ages. I have heard of several that have been replaced. Here is the number for the valve, fuel valve K-MI-6400-1/4-22-II-MSV, 2/2. I did a quick search, but didn't come up with anything, but I am pretty sure Flight Design has them. Quote Link to comment Share on other sites More sharing options...
Roger Lee Posted July 11, 2021 Report Share Posted July 11, 2021 https://www.pfeifferer-shop.de/druckluft/pneumatikventile/strom-sperrventile/pneumatik-2-2-wege-kugelhahn-k-mi-6400-1-4-22-ii-msv-e-handbetaetigt_107411_9026 https://www.lenkering-shop.de/kugelhaehne/mini-kugelhaehne-serie-k10/standard-minikugelhaehne-k-mi-6-serie/36187/k-mi-6400-1/4-22-ii-msv FD just popped the top of and screwed the lever on it. Quote Link to comment Share on other sites More sharing options...
Vic Posted July 11, 2021 Author Report Share Posted July 11, 2021 No kidding! Well hopefully FD has them and they don't cost an arm and a leg. If not I guess I'll make an order over to German and ship it back to the states. Thanks monkey Roger and Tom! You guys are always so helpful here. Will I need to drain my full tanks or can I use some sort of gas line clamp or hemostats ( care not to cut any rubber) to get the valve replaced? Quote Link to comment Share on other sites More sharing options...
Roger Lee Posted July 11, 2021 Report Share Posted July 11, 2021 You can clamp them either just inside the cowl on each side for an SW or just inside the instrument panel on the left side before the valve or filter as it comes through the firewall. Quote Link to comment Share on other sites More sharing options...
Tom Baker Posted July 11, 2021 Report Share Posted July 11, 2021 You can clamp either place, but I would do outside the firewall, because you would hate to knock the clamp off while working behind the panel. Quote Link to comment Share on other sites More sharing options...
cdarza Posted July 12, 2021 Report Share Posted July 12, 2021 I just changed mine out a couple weeks ago - bought from Flight Design. I did try to "fix" my old one as the plastic inside had warped (i have a friend that does really good work and did a great job replicating what i needed) However - end of the day, the new part wasnt expensive so it really wasnt worth the trouble to repair - and Flight Design had it available. I will add, when i found the leak at the valve i also noticed the fuel flow out of the gascolator was not very strong. Its possible the defective valve was restricting some fuel flow. Quote Link to comment Share on other sites More sharing options...
Vic Posted July 12, 2021 Author Report Share Posted July 12, 2021 Thanks all, Good to know cdarza, I'll call FD tomorrow Great tip tom! Quote Link to comment Share on other sites More sharing options...
Vic Posted July 12, 2021 Author Report Share Posted July 12, 2021 FD has the valve for a mere 28 bucks! Higher than any valve should be but not to bad I guess since they are 20$ from Germany minus shipping. I also had to order 2 different sized oetiker clamps because they were not sure what size would fit the value. 13.8mm or 14.5mm... Now I need to add another clamping tool in the ole tool box because I have never used these style clamps on anything before. Thanks for the help you guys! Ill post back with the outcome of the project. Quote Link to comment Share on other sites More sharing options...
FlyingMonkey Posted July 12, 2021 Report Share Posted July 12, 2021 $28 is reasonable! Quote Link to comment Share on other sites More sharing options...
Vic Posted July 13, 2021 Author Report Share Posted July 13, 2021 Yea it's the least expensive order I've placed so far! Quote Link to comment Share on other sites More sharing options...
Runtoeat Posted August 5, 2021 Report Share Posted August 5, 2021 Can this valve be moved while replacing it so it can be inspected and serviced easier? It is in a terrible spot, along with the fuel filter, to service. Quote Link to comment Share on other sites More sharing options...
FlyingMonkey Posted August 5, 2021 Report Share Posted August 5, 2021 30 minutes ago, Runtoeat said: Can this valve be moved while replacing it so it can be inspected and serviced easier? It is in a terrible spot, along with the fuel filter, to service. You can with an ELSA for sure, for an SLSA you'd probably need an approval note from the factory. Part of the problem with moving the valve is that it's integrated into the lower center instrument panel, so moving it might leave an ugly hole in the panel. There's not really another convenient spot for that valve unless you get pretty creative and are willing to cut some things. Quote Link to comment Share on other sites More sharing options...
Tom Baker Posted August 5, 2021 Report Share Posted August 5, 2021 I have done the fuel filter two different ways to make it easier to service, and one of them made inspecting the valve easy. The original firewall blanket installation included a stainless tube coupling that was supposed to be installed where the fuel line goes through the firewall after the valve. Some wo did the blanket installations did not install the tube. If it is installed I would use a s13 Norma clamp there and on the T at the upper firewall fuel line. With the clamps at those positions you can remove the rod from the fuel valve by removing the wire clip, remove the two screws holding the valve in place, remove the two clamps, and remove the whole assembly. It takes maybe 5 minutes. You can then service the fuel filter by unscrewing with the hoses attached. Reassembly is about the same, but you may need an extra hand to make sure the hoses slide all the way on the fittings. My now preferred method for the filter is to move it upstream of the fuel valve. I still use the Norma clamps on both ends and leave the hose attached to the filter. The second clamp is moved from the lower firewall to the "U" shaped tube. With the left side panel and the lower center panel removed inspection of the valve is fairly easy. Quote Link to comment Share on other sites More sharing options...
Vic Posted August 6, 2021 Author Report Share Posted August 6, 2021 Fuel valve replaced after it failed and leaked. Fuel filter is seen after the valve in mine Quote Link to comment Share on other sites More sharing options...
Jacques Posted August 6, 2021 Report Share Posted August 6, 2021 I recently flown a CT with a different filters arrangement. TWO filters, one each side, in the section BEFORE the T going through the firewall and the valve. very easy access. Moreover, after each filters...a check valve Quote Link to comment Share on other sites More sharing options...
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