Series 3 Ex Mil with two under seat tanks....

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This might sound stupid, but have you tried having one tank empty, and seeing which way the switch allows the engine to run?

Therein lies the problem - there's some contamination (water) got into the carb and this has happened twice now. I also have two tanks full and nowhere to put it - so I need to deal with one tank at a time, hence the question!
 
Drain a gallon or two from the tank into a billy and strain it through a chamois leather. Water should stay behind.

Barring that decant into a glass jug and allow to rest - water will settle to the bottom and can be left behind and the fuel decanted off.

Reminds me of a rig i built for separating water and oil - container with a hose/spout leading up the side tapped into the bottom corner of the container. Water/crap easily pulled off leaving cleanish oil behind.

Daughter won a science fair with a cleaned-up version of that. :)
Alan
 
The military selector tap points to the tank in use. Turn towards the offside for the drivers tank, nearside for passenger tank.
I had a similar problem with persistent fuel contamination with my military 109. It repeatedly choked inline fuel filters. In the end I drained the drivers side tank, dropped it and cleaned it out. Its a quite simple job but definitely not safe enough to recommend.
 
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