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Reply with quote  #1 
Hi,
I recently purchased a slingsby firefly and each time I fill the fuel tanks it flows out of the vents in each wing even though I have allowed about and inch in each wing tank for expansion.I have looked in the owners manual and the Maintaince manual and found No reference to over filling or to leave a gap when filling.I have filled micrilites and cessnas up to the top and never had this problem.Obviously now I am leaving plenty of room for expansion but it's a shame not to be able to carry that extra fuel.Has anyone else experienced this?

Many thanks
italmotion

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Reply with quote  #2 
Yes,a mine does he same.  If I fill above 5 inches it will overflow, then drip all night.  Ambient temperature affect how much fuel flows out the overflow.  More important is that the dripping continues for quite a while, which is no good for the hangar floor.  Im sure others have this problem, especially in warm climates.  Hve you queried Slingsby directly?
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italmotion

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Reply with quote  #3 
New info on the fuel overflow.  Measuring the fuel level at 6 Inches  or 6 1/2 it flows out the overflow, until the level reaches 5 1/2 inch. Then it stops.  It may then drip for time.  Further the fuel gauges do not read accurately above about 18 Gal (yours, not ours).
Make a dipstick out of aluminum or wood ( no plastic).  Drill a hole at the 5 or 5 1/2 inch mark, which should be about 1/2 inch below where it will overflow.  Measure the overflow level and mark your stick accordingly.  Make a couple sticks, keep one onboard, another for a spare.  A simple instrument, no batteries required, and it is environmently "green".
N103XX


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APW

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Reply with quote  #4 
Interesting.  My -200M doesn't behave like this - I normally fill it right to the top and have only seen it overflow once which I think was an airlock.  But I had been thinking of making a dipstick anyway so I can measure fuel qty more precisely.  Has anyone calibrated a dipstick for other fuel quantities?  And why can you not use plastic? 
Andrew W
italmotion

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Reply with quote  #5 
You can calibrate a dipstick specifically for your ship. It requires the tanks be empty, then fill them 2 gallons at a time.  This is a time consuming operation.  Every 2 gallons mark your stick.  Also mark the reading from your fuel level gauge.  If you happen to do a weight and balance with empty tanks, that is the opportune time to make the sticks. Concerning the sticks material, I am not a fan of plastic, not knowing the material.  Too many "Av gas" blends out there.  In the US we have had problems in the past with plastic and/or certain composite layups resins being attacked by fuel additives. This was  first seen in boats, then motorcycles, and eventually aircraft (primarily experimentals) caused by owners using auto fuel unknowingly containing  Ethanol, which is another discussion.  Even with Av fuels there can be certain plastics  that soften. Check your filler cap "lanyards", they are made of plastic that attach the cap to the filler neck.  Mine have both softened to the point where the eyes on the end have broken away from their
attachment safety pins. If this continues unnoticed, then the residue from the broken end goes into  the tank. Then what.
I have replaced mine with a Cessna kit that contains chain and new safety clips.  Anyway, if you dont like wood, there is always aluminum tubing or rod into which you drill the holes.  I have found that it is easier to read the level with fuel blocking the holes, than trying to read the wet level in sunlight. An old race car method.

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Trevord

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Reply with quote  #6 
My T67M200 does not vent fuel either. I can fill the tanks to the top without any leakage. It came with a nice piece of wood, scribed deeply at 10 litre increments and importantly with a metal T piece through the top so that you cannot drop it inside the tank !

The tanks need to be emptied to check the fuel filters, so find out when you check is due and then when it is filled for the first time, make up the stick for your aircraft.

Regards all
Trevor
Auckland New Zealand
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