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Seneca II not using full from left side.

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Joined
Feb 11, 2013
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Preflighted Seneca II. Just signed off for completed annual. But this bird sat for a year or perhaps more. Noticed that I could not see fuel in the right wing tank, but the left wing was full to the cap. This is after testing run ups, and a 15 minute flight in the pattern. When I move the Right selector valve, I can something move in the direction of the right wing, and there is a palpable detent in the selector position for "OFF", which is center. I don 't feel or hear those for the left selector.
Also, I did not look at it, but there may be an issue with a clogged fuel tank for the left side?
I filled the tanks to check for leaks.
Now I am thinking I should have ordered all the old fuel to be drained, and then filled it. But I still wouldn't have known about the 'left tank remaining full' issue until I visually inspected yesterday.
Trying to find a schematic on the fuel selector valve system, and the linkages, and where the problems may lie. Wondering if that all fuel in there now should just be drained and start over. And if the fuel selector valve has to come out to be cleaned, does all the fuel have to be drained first? Maybe that would be a good idea, and to air blow the lines for crud and particulates?
Thanks for reading. Any experiences appreciated.
I posted in 'Maintenance' here also, please bear with me.

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