GumpAir wrote:kevbert wrote: I'm curious how other people deal with frozen water in their fuel system other than a heated hangar.
If it's below freezing, or recently been below freezing I won't touch the sumps. All you'll do is jam the valve open. Any water in the bottom of the tank is going to be frozen, and it's not going to go anywhere.
Gump
You're right, I did jam one open once! I had to push against it with the palm of my hand, alternating hands every 30 seconds, for several minutes until it thawed and popped back down. There was something about the icy cold fuel running the length of my forearm and dripping off of my elbow, coupled with the frost-biting nature of the fuel evaporating that really said I was an idiot.
So, then I listened to conventional wisdom and decided that the frozen water would stay frozen.
Then I flew one time from Sandpoint (a colder part of Idaho) to Lewiston (probably the hottest place in Idaho). The temp had gotten down in the mid 20s that night in Sandpoint, and it was into the mid to upper 30s by the time I took off. The sun melted the frost off of my wings, but the valve was still frozen shut. It was about 70 degrees when I arrived in Lewiston. I decided to try draining it when I got there, and took about a pint out of the wing. Then I looked at the sediment bowl by the engine, and it was over half full of water. So, that made me very nervous, and I started the warm fuel ritual.
Eventually, I did what I should have done in the first place. I replaced the fuel cap gaskets, even though they looked fine. That improved the problem quite a bit, but didn't totally fix it. I've since learned to stretch the gasket a little to look for cracks. Then, I talked to a good Cessna mechanic, and he put some sealer at a magic spot near the fuel neck, and the problem seemed to go away.