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It's the fine little details of fuel sys that makes a difference. Wet pumps better than exterior pumps. One fuel inlet for each pump. Inlet should have one of those course self cleaning filters on it. The type used in cars. Only use fine mesh filters on pump outlet, one for each pump.
If you're going with external pumps, important to place them as low as possible to reduce vapor lock risk. Important to shield pump from engine heat.
Do not assume simple is safer. Your goal safety. Very good to assume you will mismanage it. Best to have computer monitoring, or at least have gages that go nuts when they see low fuel.
Those expensive dual port fuel valves are a good solution. I know some of the guys on this list have well designed fuel systems, I'd be quick to copy one that considers failure modes.
-al wick
----- Original Message ----- From: "randy echtinaw" <rjechtinaw@toast.net>
Gentlemen,
Because a large majority of homebuilt problems are fuel related I
am trying to make my system as simple as possible. This is a biplane
with a 20 gal. and a 10 gal. tank in front of the inst. panel, RX-8
engine.
The only "known" problem I have at the moment is my fuel return. I
would like it to return to the main tank only. This would mean burning
off 2-3 gallons from the main tank before switching to the 2nd tank.
But, this might mean I am setting myself up for a future "pilot error"
in fuel management. If I return to both tanks I would need another
selector and cockpit control which is making the system more
complicated and, again, potential "pilot error." So, suggestions . . .
Thank you very much,
Randy
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Homepage: http://www.flyrotary.com/
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-Al Wick
Cozy IV powered by Turbo Subaru 3.0R with variable valve lift and cam timing.
Artificial intelligence in cockpit, N9032U 240+ hours from Portland, Oregon
Glass panel design, Subaru install, Prop construct, Risk assessment info:
http://www.maddyhome.com/canardpages/pages/alwick/index.html
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