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From: RWolf99@aol.com
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Date: Mon, 4 Dec 2000 03:15:22 EST
Subject: Re:  Pyrex sight gauges
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In a message dated 12/3/0 9:49:18 PM, David Jones wrote:

<<The use of 5/16 glass tubing in the cockpit to carry gasoline would not be 
safe.  Please abandon this idea.  Take it from one who knows.>>

David -

I admit that I am not a chemist.  However, I worked in a chem lab for a 
couple of years with several chemists, and was very impressed by their 
knowledge, so rest assured that I do listen to chemists.

I'd like to know the basis for your objection to pyrex tubing for a sight 
gauge.  Is it a chemical compatibility issue or the fact that, basically 
being glass, it is possible to fracture?  We're talking about a short stubby 
section here, though I'll admit, a glass line doesn't seem like the best idea 
I've ever had...

Concerning tygon, there are fuel-compatible tygons and fuel-incompatible 
tygons.  Hey, I'm an engineer, not a chemist.  If the label says "designed 
for petroleum-based products such as gasoline", as does Tygon F-4040, then 
why not use it?

There's no doubt that running fuel lines through the cockpit is dangerous.  A 
little hard to avoid, though.  So having the safest fuel lines possible is 
the goal.  

- Rob Wolf
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