Yes. Not good on low wing aircraft, because you have to suck the fuel uphill. If you are selected on both, and one fuel pickup is sucking air, you won't get any fuel out of the full tank.
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JV
Calgary, Alberta, Canada
RV7 QB - Airframe largely complete, sans canopy and glass... unfortunately sold
RV6 - O-360-A1A, Hartzell CS, dual G3X VFR... purchased
Dues paid 2015
"Being defeated is only a temporary condition; giving up is what makes it permanent."
-- Marilyn vos Savant
If you do, I would suggest you block off the both position if possible.
This type of valve is generally used with gravity flow fuel systems, it is not really ideal for low wing planes------if you are in both, and one tank runs dry, you will be sucking air.
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Mike Starkey
VAF 909
Rv-10, N210LM.
Flying as of 12/4/2010
Phase 1 done, 2/4/2011
Sold after 240+ wonderful hours of flight.
"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
Once it starts sucking air, it may take a little time for the elect backup pump to get it primed again, if it does at all. If you have ever been in one when it sucked air, it can be a rather discomforting feeling. Seems like, if I recall, the pucker factor maxes out while its takes it sweet little time re-priming....
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Craig
RV-3 Sold
RV-4 Sold
RV-6a Sold
RV-9 IO-360 CS, Built and Flying
Aerostar 600A, Family Hotrod
RV-7 Fuel Selector valve
Linear Mode
