Thread: Discussion Saito FG-21 gasser
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Old Jul 26, 2012, 09:53 PM
MercerMaggot is offline
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Canberra Australia
Joined Jun 2009
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You should run three lines. For the carby feed line, use a Walbro felt clunk. You can buy them at any small engine (eg chainsaw) shop. They provide the best filtering and will continue to draw fuel even if only a small part of the clunk is covered/splashed.

The second line is for your vent. Make sue you wrap it around the tank once so it won't leak when you are flying inverted.

Your third line is for refueling/defueling and you can just use a normal sintered clunk. Make sure you close off the line with a cap for when the engine is running.

Try to minimise the length of fuel tubing for these engines as they can't suck very far.

Use a small fuel tank (maybe 100ml). This will last 15-20+ minutes. I have a FG-20 with a 400ml tank buried in the belly of the plane (eg hard to get at). I neglected a decent defueling line and it takes at least an hour of flying to fully run dry. These engines are super economical and you don't want or need a big tank with extra petrol sloshing around.
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