Hello all,
I'm in the middle of designing my fuel system and wanted to see
what type of problems I might run into with the following
configuration. I've got an RV-4, plan on using two fuel pumps,
a purolator fuel filter/moisture separator, and was thinking of
using an electric 6 port switching valve. The idea was to keep
high pressure fuel lines out of the cockpit. I have since re-
thought the necessity of having the electric 6 port switching valve.
Eliminating it would eliminate one more thing that could fail along
with it's weight. So here's what it would look like:

One fuel pump per tank, either in the tank or close by, each
 feeding fuel to the fuel filter. This is assuming that the fuel
pump has an integral one way valve.(the filter has two inlets)
The fuel would flow from the filter to the two fuel rails,
 and the return would go to the manual three port valve mounted in
the cockpit. I'd have to select which tank to return fuel to manually.
A three position on-off-on switch would be used to select either pump,
which would in effect select tanks.

I'm somewhat leary of designing my own fuel plumbing, but I think
 that this design might have merit.
Please fire away if you see  any likely problem areas.

Brian Trubee
RV-4
Redmond,WA

 
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