Fuel tanks with clear ends

neil_1821 · Apr 24, 2018

Looking at a variety of models, YouTube, google image search I always seem to find fuel tanks that have visible ends, quite useful to see how much fuel you have left!

Can anyone enlighten me as to how they are built?! Id assume its glass rather than Perspex giving that it holds fuel, but how are they sealed as to not leak? O rings, gasket, interference fit?

R Degen · Apr 24, 2018

You have to use lexan and I use an oring to seal it with a press fit. Randy

rickhann · Apr 24, 2018

I have used old watch crystals for small tanks. It's been a while, but I think I just turned a brass ring too fit the crystal and epoxied the crystal in. Been several years with no leaks.
rick

cheepo45 · Apr 24, 2018

I used a watch crystal from Amazon glued into a recess on the brass tank end with gorilla super glue.
It has been almost a year and a lot of hours running and it's still holding up fine - no leaks. I'm running Coleman fuel with a little WD-40.

neil_1821 · Apr 24, 2018

Ah yes thats lovely, Im intending to use Colemans fuel. You cant even see the superglue, very nice. Ill have to try making one soon.

Engine maker · Apr 24, 2018

Yep, way back when, I was looking for some way to put a small neat fuel gauge on a tank, then it dawned on me to make the whole tank a gauge. I have a problem with filling the tanks. I always try to get 2 1/2 oz. of fuel in a 2 oz. tank and as many times as I've tried it, it still doesn't fit!

FYI the glass is flat mineral glass watch crystals, (Plexiglas crazes after a while). Cost about $ 9.50 for a set of 3. You can get it any dia. (goes up by .004" or .1mm sizes) and thickness - 1.0mm, 1.5mm, 2.0mm, 2.5mm, and 3.0mm. The 3.0mm thickness equals .120" so if you make a 1/16" recess in the tank flanges and one in the fuel tank side you can put a nice thin "O" ring inside for a seal. Never had one leak yet! I get mine here www.ofrei.com/page1190.html
Be careful it is a large site and easy to get lost.

Jim G