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Robert

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    Carson City, NV
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  1. Robert

    No fuel crossfeed.

    Al, I believe it is trapped air in the fuel lines. It flows out just fine, but will not flow back the other way. I believe this is limited to some of the CTLS and not the CTSW or the CTLSi due to the larger risers in the A pillar and the slightly restricted fuel lines at the 90 degree bend at the wing connection. If it concerns you, then drain both tanks, put a few gallons in side 1 and gently pressurize that tank until side 2 has a couple of gallons in it. Clamp side 2 above the T connector and drain side 1 completely. Remove the clamp and gently pressurize side 2 until both tanks are even. Put five gallons in either side and watch as they now equalize in a short time. Then you will have to read all the tips everybody has provided on this site to transfer fuel in flight. (Fuel follows the ball) Also, don’t pressurize the tanks over about two psi to prevent any damage. I made an adapter that fit over the filler port and blew into it using lung power. Robert
  2. Robert

    No fuel crossfeed.

    Physics is fixed. The short answer is that air was trapped in the A pillar tubes. This barely slowed the flow down, but allowed no flow back up to the tank. The solution was to fill the tubes from the bottom by blowing air into the opposite tank and forcing fuel up up into an empty tank; then doing the same on the opposite side. The clue that gave it away was a gurgling sound as I finally ran up without a headset on. My flow increased from 90 liters per hour to 125 liters per hour and I can now fill the aircraft by dumping fuel in just one side and it will level out in a short time. Thanks all Robert
  3. Robert

    No fuel crossfeed.

    Tip: I could not find any reference to the springs in the fuel lines LOA or otherwise. Can you send me your reference? thanks Robert
  4. Robert

    No fuel crossfeed.

    Thanks for the replies. Roger, I will raise the wing even further to increase the pressure head. However, the fuel should act as a water level and even with little pressure head will seek its own level, just at a reduced flow. As I am using the sight tubes to measure the fuel in each tank, I can say with a certainty that if any fuel flowed it was less than a pint in 24 hours. How much flow do you measure on the fuel flow tests you do? The 90 liters per hour I get is above the 35 liters per hour minimum specified in the maintenance manual, but I don’t have any other frame of reference for comparison and maybe both sides are restricted. EFB, I am not dipping for my reading. I am using the sight tubes that I have marked in one gallon increments. Also, I checked the flapper valves on this annual and they move freely. Although, I did notice that my beer tends to disappear faster on days that the CT isn’t flown, so maybe space time does have the plane trapped in the quantum foam. TIP, I do not have the elbow and the line does have to make a 90 degree turn. Which is why I do the flow test after every wing removal and manually check the line for kinks. If current CTs have the spring in the fuel line, then I will not need approval to install it. I have wanted to do this for awhile, but didn’t because it is an SLSA. This will be a good time for that, because I am not going to sign off this annual until I find out why it doesn’t crossfeed like every other CT in the fleet. It was actually everybody on this site talking about their crossfeed issues that caused me to try to measure it. Oh well, off come the wings again. MeHenck. Wow. I mean, wow. I pulled the wings this annual because I found some cottonwood fluff about the size of one of your rocks in the inline filter and wanted to ensure the rest of the tree wasn’t in the coarser screens in the tanks. If I found what you show, everything from tank to carb jets would have been replaced after panning that gravel for gold to pay for it of course. That being said. I have found some Hylomar residue in the tank on previous checks., so there is that small possibility. Again thanks for giving me some ideas. This is not a safety of flight issue. Just dammed strange. Robert
  5. Robert

    No fuel crossfeed.

    Hi all: Physics is broken in my hangar. 2008 CTLS. Leveled with a digital level. 14 gallons of fuel in one side and none in the other. Let sit overnight, no change in fuel levels. (Must be a pinched line right?) So I conduct a fuel flow test. 90 liters per hour left side; 89 liters per hour right side. (No pinched line.) Run fuel, one side at a time, by clamping the opposite side to ensure no air blockage in the lines. Place right wing on ladder so it is 14 inches higher than the left wing, remove fuel cap (just in case it is a pressure issue) and let sit overnight. No change in fuel levels. This is not a complicated fuel system, so what am I missing? There are no valves or other devices between the fuel pickup in the tanks and the T connector behind the instrument panel. Although, my T connector is really a Y connector. It fails no test in the manual and operates normally, but... that pesky physics thing and I must understand what is going on to safeguard my sanity. Any ideas are appreciated. If Rod Serling started narrating in the background, I would not be surprised. Robert Harington
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