rparigor(at)SUFFOLK.LIB.N
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 Posted: Wed Jan 24, 2007 11:37 am Post subject: What's advantage of conductive fuel hose? |
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I am working on final plumbing of Europa / Rotax 914 fuel system.
The system is a plastic rotomolded fuel tank, mostly rubber automotive
5/16" fuel injector hose, 2 vane style electric fuel pumps.
I have plumbing completed to 2 Flowscan 201B fuel flow sensors (add flow
in, and subtract return to tank).
I want to use Aeroquip 666 to run from the 201B through firewall to the
fuel pressure regulator, and then from the fuel pressure regulator return,
through the firewall to the return 201B.
I read somewhere that the 666 hose has stainless braid on the outside,
Teflon hose on the inside and it is electrical conductive. Didn't think
much about it, I just assumed that they were talking about the braid.
After getting a sample of the hose, I see that they have the internal wall
of the hose coated with a black substance that is probably;y electrical
conductive.
2 Questions:
1) Why would you want the internal wall of a hose electrical conductive?
I read 43.13 and they really don't tell much as to why. If it is static
discharge, is that really important? There are plenty of cars on the road
with rubber fuel lines?
Perhaps for lightening strike??
If I use this hose in my system (approx 4 feet in and 4 feet out) am I
creating any problems? Aeroquip makes very close to the same hose for Auto
racing guys without the black conductive coating. You see this as a more
appropriate hose for my system/plane?
2) More of a concern I think is there is this thin black coating inside a
Teflon tube. If it begins to flake off, it could cause much problems.
Has anyone had any flaking problems?? I can easily see causing an upset to
this coating when installing hose ends.
Thx.
Ron Parigoris
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