REFLECTOR: Sump Tank Outlet

Pat Shea xl340hp at yahoo.com
Wed Jul 4 13:09:00 CDT 2007


Joe,

Do you have an RG with the 2-3 gallon sump tank
mounted flush up against the firewall? If so, what you
suggesting might make it hard to remove the sump tank.
Also, even a very small seep from a fuel fitting can
really smell up the cabin, but these are very easy to
spot and fix if you can see all the fittings.

A bulkhead fitting is the generally accepted way to
pass through the firewall. Without one you would need
to make sure there's no chaffing, seal, and also fire
protect the hole itself. Doing all that is going to
make for poor serviceability. The bulkhead fitting
allows you to run a rigid unprotected fuel line on the
cabin side of the firewall and then switch to a
flexible fire protected hose in the engine
compartment. The standard aviation practices are a
little over the top sometimes, but since we're dealing
with fuel supply here it seems like a safe bet.    

Just food for thought...

Here's a link to a pic of my sump tank - maybe you
have something different:

http://www.tvbf.org/gallery/?display=airframe_construction%2Fsump_tank%2Fretract_gear%2FDscf0055.jpg

Pat

--- Joe Ewen <jewen at comporium.net> wrote:

> My instruction manual calls for running the fuel
> line from the sump tank to the engine via a port on
> the front of the sump then via a bulkhead fitting
> through the firewall.  Does anyone see a reason that
> I could not take the line from the rear of the sump
> tank and through a clearance hole in the firewall? 
> This would result in a shorter, more direct line and
> have 2 less connections.



       
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