Kevin,
You are on the right track.
If you are using Facet fuel pumps they typically do not have the built in
check valves like the high pressure pumps that Tracy sells.
I am using a Facet pump as a "Boost" pump mounted close to the fuel tank
to feed the high pressure pumps on the firewall.
I also have a gravity feed line to the fuel pumps with a check valve in it to allow fuel to flow
to the pumps, by-passing the boost pump.
The boost pump was something that the designer of my plane thought I might need when he inspected my fuel system.
Jim Maher
Dyke Delta 13B
--- On Mon, 9/6/10, kevin lane <n3773@comcast.net> wrote:
From: kevin lane <n3773@comcast.net>
Subject: [FlyRotary] check valves [again]
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Date: Monday, September 6, 2010, 1:26 PM
when Tracy asks me why I'm using check valves, maybe I'm missing a big point [not again!]. I thought it was std practice to run redundant electric fuel pumps in parallel. I was going to use check valves to keep the flow going the right direction. some facet pumps have built-in check valves,[40148] but I have yet to locate anyone who sells them. I am using a Weber carb, so only need low-pressure pumps. I had actually bought a "red pump" like Lynn suggested, but two of them weigh like 10 lbs. I was hoping 2 facet cube pumps would work for me. a bosch 68758 also may work, but I can't find all the specs for it.[pressure?, volume?]
so is the redundancy overkill?
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