Some ideas here:

http://www.donsbushcaddy.com/sitebuildercontent/sitebuilderfiles/sightgaugeinstructions.pdf

On Mon, October 15, 2012 9:03 pm, Mark Langford wrote:
> KRnetHeads,
>
> It's been kind of quiet today, so let me throw this one out there.  When I
> bought N891JF, the sight tube was discolored due to age to the point that
> I could barely see through it.  I updated it with new tubing from McMaster
> Carr, Tygon F-4040-A, which is what was used originally.  The problem is
> this tubing is extremely yellow, and it wipes out the blue dye in the
> 100LL fuel to the point that it's like water.  You can only see the
> dividing line (miniscus) of the fuel level, and that takes some searching
> most of the time.  The easy solution would be to put a little ball of some
> sort in the tubing, and it would have to be 3/16" or smaller to freely
> float to the surface.  Anybody have an idea on a source for something that
> would work for that job?  Another option (but not as attractive as the
> floating ball) would be a clear tubing that's proven to work with fuel.
> Any ideas?
>
> Having seen three fuel level sensors fail on N56ML, I'm already a big fan
> of the sight tube thing, although it does mean "fuel in the cockpit".
>
> Before I hit the "send" button, it occurred to me...a cheapo electrolyte
> hydrometer would probably offer some balls that would work, but that
> remains to be seen (yes I would look up the density before I wasted the
> $3).  Any other options?


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