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Old 08-01-2017, 05:24 PM
JonJay's Avatar
JonJay JonJay is offline
Join Date: Jan 2007
Location: Battleground
Posts: 3,527

Have you pulled your EMS data and looked at your fuel pressure coinciding with the known event?
Smart People do Stupid things all the time. I know, I've seen me do'em.

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Old 08-01-2017, 07:48 PM
vernon smith's Avatar
vernon smith vernon smith is offline
Join Date: Jun 2017
Location: Naples FL
Posts: 26

I'm a neophyte to aviation systems but these type of problems are solved with header tanks or swirl pots in other applications. Some added weight and plumbing complication, maybe six pounds including the tank/pot and plumbing.
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Old 08-02-2017, 08:21 AM
Guy Prevost's Avatar
Guy Prevost Guy Prevost is offline
Join Date: Jan 2005
Location: albuquerque, nm
Posts: 1,075

My RV-10 has Bendix mechanical fuel injection, so this may be useless information.

I had a similar issue that was resolved by one (or both) of two changes. I moved my fuel flow transducer from the tunnel where it was on the suction side of the system to the pressure side of the system between the servo and spider. I did this because having it on the suction side invites vapor formation at the transducer, especially when heat soaked. While performing this work, I did find evidence of a slight leak at the outlet of the electric boost pump. I could never smell fuel--I just found a little bit of staining at the fittings. I had no more issues after those two corrections.

Guy Prevost
Albuquerque, NM
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Old 08-02-2017, 09:04 AM
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Bluelabel Bluelabel is offline
Join Date: Aug 2013
Location: San Diego, Ca
Posts: 366

Thanks for all the input... even though I just got done my condition inspection and had the tunnel open, maybe there is a chance of a leak that will invite air yet not leak any fuel. Time to put a wrench on each fitting again.
I will also see if running both pumps at the same time helps.(the problem is the the situation happens so infrequently).
I can pull my Garmin data logs. I'll should be able to at least see the conditions of flight.
John Walker
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"Miss Whiskey Delta"
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KEOS, Neosho, MO

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Old 08-05-2017, 06:25 PM
Strasnuts Strasnuts is offline
Join Date: Jan 2009
Location: Salt Lake City, Utah
Posts: 526

+1 for Jonjay and Jesse.

I've never experienced a hiccup in the 800+ hours of switching. I have a stock setup engine with an andair fuel valve.
I don't use the electric pump in the process.
A&P RV-10 Flying 800 hours
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Last edited by Strasnuts : 08-08-2017 at 06:50 AM. Reason: added info
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Old 08-05-2017, 07:11 PM
nilberg nilberg is offline
Join Date: Dec 2012
Location: Katy, TX
Posts: 108

Here is my theory:
I assume your valve is above the tank fuel level. The fuel line is also in suction upstream the electric pump. I think you have a small leak in the line, probably at the valve connection. When sucking fuel, there is no fuel leak, just air suction, so small that the engine is ok with it. When the fuel line is inactive, the small leak is causing air to be sucked in causing venting and leveling with tank level. Now you have a air pocket in the line and next time you switch over, the engine stumbles.

Last edited by nilberg : 08-06-2017 at 09:40 AM. Reason: Misspelling from autocorrect
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Old 08-06-2017, 07:34 AM
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David-aviator David-aviator is offline
Join Date: Feb 2005
Location: Chesterfield, Missouri
Posts: 4,368

What does Robert have say about it?
He must have an explanation, it's his system.
David Domeier
RV-7A...Sold #70374
The RV-8...#83261 flying as of 6/16/2014

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Old Today, 04:35 AM
amekler amekler is offline
Join Date: Aug 2009
Location: Gilford,NH
Posts: 57

i've had this happen twice in my 8 years with n668g
both were on hot days running lean of peak and changing tanks without using the boost pump. i've never had it if happen when using the boost pump.
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