On 8/4/2019 7:05 PM, Jeff Scott via KRnet wrote:
Facet does make a line of pumps with a check valve in them to prevent backflow.
I haven't personally tested one yet, so can't say how effective they are.
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My two Facet fuel pumps are installed in parallel. My concern was that
one pump running and the other shut off it might set up a continuous
circular flow backwards from the "on" pump through the "off" pump and
back to the intake of the "on" pump with no fuel going to the carb.
Before installing the pumps I hooked them up head to head and tried to
pump backwards through each pump. Zero fuel flow so I eliminated the
planned check valve. To date, 15 years and 700+ hours, the system is
working fine and any time above pattern altitude I only run one pump.
Larry Flesner
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