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Header tank fuel loss

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02 Sep 2021 16:50 #1 by Brady Buttterfield
Replied by Brady Buttterfield on topic Header tank fuel loss
I noticed the same thing and am closing the fuel valve at the dash and on the floor during shut down and it seems to no longer lose gas in the header tank while it sits inside.

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30 Aug 2021 16:15 #2 by Larry Snyder
Replied by Larry Snyder on topic Header tank fuel loss
My bobber drops an inch or so if the plane sits a while. My fuel valve is closed, too, so it’s not a leaking carb needle. I chalk it up to evaporation. Remember, the trip from all the way up to all the way down on the bobber is about 2 ½ gallons of fuel. So you’re not losing a lot. I’m not even sure we’re losing anything. But I’ve been flying it for 17 years that way!

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30 Aug 2021 15:20 #3 by Morris Pearson
Header tank fuel loss was created by Morris Pearson
Noticed that after several weeks, it seems that the fuel level in the header tank goes down by a gallon or two. Fuel line vale to primer and carb is closed. No signs of any leakage anywhere in cowl or behind panel. Does not seem reasonable that fuel would backfeed thru the fuel pump and back into the wing tank. Anyone observed this before?

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