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Old 04-29-2019, 04:08 PM
DaleB's Avatar
DaleB DaleB is online now
Join Date: Sep 2012
Location: Omaha, NE (KMLE)
Posts: 2,122

Originally Posted by JosephineJ79 View Post
Here are good reasons for shutting off the electric fuel pump.
1. When the mechanical pump fails, you will find out immediately that it is not working. Why have to wait until the next pre-flight run up?
2. Shutting off the electric pump is a good way to test the vapor pressure of non-leaded gasoline. Fill the tank with your favorite brand of automotive fuel. Shut off the electric pump soon after takeoff and climb until the engine sputters. Note the altitude. Land, then repeat the test with other brands of fuel.
3. Save electricity.
And counterpoints for NOT having it switched:
1.) One more switch simply means one more switch to forget or fail.
2.) The system was designed to run with the electric pump on all the time.
3.) You'll have less chance of the engine sputtering at altitude to begin with.
4.) The amount of electricity used by your fuel pump will not make a measurable difference in your speed, fuel consumption or anything else.

I very much prefer to do my testing on the ground rather than in flight, thank you.

Just my $.02 worth, keep the change.

Omaha, NE
RV-12 # 222 N980KM "Screamin' Canary" (bought flying)
Fisher Celebrity (under construction)
Previous RV-7 project (sold)
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Old 04-29-2019, 04:53 PM
pilotyoung pilotyoung is offline
Join Date: Jan 2018
Location: Birmingham, AL
Posts: 124
Default High fuel flow

Thanks to those of you who expressed your opinion.
John D. Young, RV-12 Owner
Serial Number 120022, N6812Y
Bought it as a flying airplane in Feb. 2018
Just passed 140 hours flight time in RV-12, and 10,000 hours mostly in corporate jets. I am a CFI; CFII; MEI; and a advancd Ground Instructor, CFIG; and hoping to be able to help new RV-12 owners by doing some transition training for new builders and owners in RV-12's.
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