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I'm having a couple of fuel-related problems with a 1965 Alon.
1. On days when the temperature rises moderately and the plane is sitting in the hangar, fuel will leak out of the header tank cap vent and on to the cowl. This happens most often during the summer, but has also occurred during the fall on days with temperatures in the 50s - 60s. I thought that the fuel should flow back into the wing tanks via the overflow lines.
2. When it is flying, the header tank fuel indicator will rise to full shortly after I level off. Last week during a 30-minute flight, fuel appeared in the glass tube that covers the header tank indicator. About 1/2" at most. It was gone by the time I landed.
Last week I ran vinyl tubing down inside each of the overflow lines leading to the wing tanks and blew air thru, hoping that I might find some sort of blockage. Both lines were clear.
Tonight I flew the plane for about 15 minutes. After I landed, a shot of fuel came out of the header tank vent and covered the wind screen for a few seconds.
After I shut it down I opened both wing caps. I heard pressure leaving each of them. The left wing tank was full, but the right was down noticeably.
The wing tank caps are not vented, but I usually leave about 1/2" between the top of the tank and the fuel level. I usually fill the wing tanks only and let them feed the header tank, so I don't think I'm overfilling.
Right now I don't fully close the caps while it is parked in the hangar and this seems to take care of problem #1.
Any help would be appreciated.
Thanks,
Leigh
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