Jeff Spitzer wrote:

Perry Mick wrote:

I put the Mazda fuel pump in a small tank, about 1/2 gallon
capacity.  This is at the lowest point in the fuel system.  The
selected main tank, left or right, drains into this small tank
by gravity.  There is a single vent line from this small tank to
the top of the firewall, behind the passenger's head. The fuel
return from the engine returns to this small tank.

Does anyone see a problem with this setup?

I've thought about putting in a second fuel pump for redundancy.  They
would not be in series, but two pumps feeding a common output line.
Could both be on simultaneously, or would it be either/or?

--
Perry Mick
Duckt N7XR
http://www.mickaircraft.com/duckt.htm

This is a very common setup.  On the dual fuel pumps my opinion is you
*must* have redundancy.  At work we have a very novel way to do this that I
haven't seen anywhere else.  The two fuel pumps are in series when running
together.  This avoids capacity difference problems of lines and
regulators.  The pumps share the pressure load and only pump slightly more
than a single pump.  There is a bypass line and two check valves that allow
either pump to work alone.  If the "first" pump is used, fuel flows into it
directly and flows out through a tee fitting between the pumps.  A check
valve prevents backflow.  If the "second" pump is used the fuel bypasses
the "first" pump through another tee and check valve and flows the other
way through the bypass tube and previously mentioned tee into the second
pump.  If anyone gets this I'll be amazed...I guess a sketch is in order.

My only other concern with the Perry's system is that it requires a header
tank in the fuse.  I just don't like having a fuel tank that close to me.
Is this just me?  I was wondering if anybody had a system with no fuel in
the fuse?

Jeff Spitzer

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