What was OAT at the time of filling? What was the temp of the wing when filling? What was the temp of the fuel when filling? This kind of thing happens often when cooler fuel is put into a warmer wing, and the fuel expands in the tank. Jut because it was only 11.5 in a 16 tank doesn't mean that expansion didn't occur, and the fact that it only happened in the turn just leads me to believe that this was just a bit of thermal expansion in the tank, and it sloshed out when you turned. Did it happen to the right wing in a right turn? If so, then this is pretty normal. However I do agree that going to vented caps is better way to go. I've seen this same thing happen in a Dassault Falcon 50 for the same reason.
OAT about 30 F, about the same when filled to 12 gallons, they don't tell me the temp of the fuel, but the hose was cold! The fuel had been sitting in the aircraft for a few days before these flights. Could not see the right wing, but I'm really interested to see that side. Vented gas caps don't seem like a reality, so I'm going to stick something in the vent line to decrease the size. I mean sure, be a vent, but I don't need a 1/2" vent (its probably 3/8")
You wouldn't believe the amount of testing I went through with those tanks! I bought the aircraft knowing the fuel quantity was faulty. One tank read 0 all the time, the other read 6 gallons all the time. I replaced the fuel sensors, then to calibrate it, I drained the tanks and added one gallon at a time till full and measured the gas level at the filler cap (when it got up that high). I did get 16 gallons in, but they are really 15 gallon tanks. When this venting happened, I was at 11.5 gallons on each tank, way below full. The fuel vent is the part that kills me, its a tube I'm guessing around 1/2" in diameter! Why would you ever need a vent that large? And it is about 1/4" from the highest level of the tank. So as far as fuel level and vent goes, I believe it's just too large a vent tube. Maybe could use a baffle! Actually, that's not a bad idea...
Hmmm - I'd do what you're gonna do. Take a look at that. Seems like that's going to be a hard fix, the overflow tube in the tank might be poorly installed/too low/loose. Seeing all the issues the previous owner left you I wouldn't be surprised if it were made from an old drinking straw
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That's Zenith's venting system in action. Most people now during construction close that vent and just use vented caps.
I like that idea!
Just overfilled it a bit. Some planes like Bonanzas have antiventing valves to prevent it.
Nope, it only had 11.5 to 12 gallons in a 16 capacity tank.
@@F111BMATHIS something is up with it then. I wouldn't fly it until you figure it out.
What was OAT at the time of filling? What was the temp of the wing when filling? What was the temp of the fuel when filling? This kind of thing happens often when cooler fuel is put into a warmer wing, and the fuel expands in the tank. Jut because it was only 11.5 in a 16 tank doesn't mean that expansion didn't occur, and the fact that it only happened in the turn just leads me to believe that this was just a bit of thermal expansion in the tank, and it sloshed out when you turned. Did it happen to the right wing in a right turn? If so, then this is pretty normal. However I do agree that going to vented caps is better way to go. I've seen this same thing happen in a Dassault Falcon 50 for the same reason.
OAT about 30 F, about the same when filled to 12 gallons, they don't tell me the temp of the fuel, but the hose was cold! The fuel had been sitting in the aircraft for a few days before these flights. Could not see the right wing, but I'm really interested to see that side. Vented gas caps don't seem like a reality, so I'm going to stick something in the vent line to decrease the size. I mean sure, be a vent, but I don't need a 1/2" vent (its probably 3/8")
Yippiekaiyaaa
Fully drain you tank, see how much it takes to top it off! Till then, don't plan on 16 gallons!
You wouldn't believe the amount of testing I went through with those tanks! I bought the aircraft knowing the fuel quantity was faulty. One tank read 0 all the time, the other read 6 gallons all the time. I replaced the fuel sensors, then to calibrate it, I drained the tanks and added one gallon at a time till full and measured the gas level at the filler cap (when it got up that high). I did get 16 gallons in, but they are really 15 gallon tanks. When this venting happened, I was at 11.5 gallons on each tank, way below full. The fuel vent is the part that kills me, its a tube I'm guessing around 1/2" in diameter! Why would you ever need a vent that large? And it is about 1/4" from the highest level of the tank. So as far as fuel level and vent goes, I believe it's just too large a vent tube. Maybe could use a baffle! Actually, that's not a bad idea...
Hmmm - I'd do what you're gonna do. Take a look at that. Seems like that's going to be a hard fix, the overflow tube in the tank might be poorly installed/too low/loose. Seeing all the issues the previous owner left you I wouldn't be surprised if it were made from an old drinking straw
Nah you’re just spraying weed killer on the taxiways.
Tank too full?
Nope, it only had 11.5 to 12 gallons in a 16 capacity tank.