Today's Message Index:
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1. 07:41 AM - High fuel pressure warning (Ralph E. Capen)
2. 11:34 AM - Re: [lycoming] High fuel pressure warning (Ralph E. Capen)
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| Subject: | High fuel pressure warning |
While flying my RV6A yesterday, I got an intermittent High Pressure warning from
my AFS3400EE. The trigger is set to 60 PSI. The boost pump was not on. Fuel
flow remained normal and engine ran properly. Aborted the training session,
returned to homeplate, and checked for leaks or other evidence of actual overpressure...with
no success!
This is an IO360B1F6 with AFP injection and the FI mechanical pump.
Can the mechanical pump generate that high of pressure with normal fuel flow?
It was below freezing at altitude but I've never heard of avgas (30% 100LL and
60% ethanol free car gas) getting thicker at low temperatures.
My current thinking is that I may have something in the Fuel Pressure Sender that
either causes it to act like a pressure accumulator or falsely signal high
pressure.
Any thoughts would be appreciated!
Message 2
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| Subject: | Re: [lycoming] High fuel pressure warning |
Thanks Tim!
-----Original Message-----
From: "Tim Lewis timrv6a@earthlink.net [lycoming]"
Sent: Mar 13, 2017 12:59 PM
Cc: lycoming engine list
Subject: Re: [lycoming] High fuel pressure warning
A very good video (from Tempest) on the high pressure fuel pump: https://www.youtube.com/watch?v=PYKoLUsTJU4
-----Original Message-----
From: "Kevin Horton khorton02@gmail.com [lycoming]"
Sent: Mar 13, 2017 12:03 PM
Cc: lycoming engine list
Subject: Re: [lycoming] High fuel pressure warning
My understanding is that these pumps use a spring to create the pressure. It is
hard to envision a failure mode where the spring creates more pressure than
designed, so this is almost certainly a problem with the indication.
Kevin
On Mar 13, 2017, at 10:40 , 'Ralph E. Capen' recapen@earthlink.net [lycoming] <lycoming@yahoogroups.com>
wrote:
While flying my RV6A yesterday, I got an intermittent High Pressure warning from
my AFS3400EE. The trigger is set to 60 PSI. The boost pump was not on. Fuel
flow remained normal and engine ran properly. Aborted the training session, returned
to homeplate, and checked for leaks or other evidence of actual overpressure...with
no success!
This is an IO360B1F6 with AFP injection and the FI mechanical pump.
Can the mechanical pump generate that high of pressure with normal fuel flow?
It was below freezing at altitude but I've never heard of avgas (30% 100LL and
60% ethanol free car gas) getting thicker at low temperatures.
My current thinking is that I may have something in the Fuel Pressure Sender that
either causes it to act like a pressure accumulator or falsely signal high
pressure.
Any thoughts would be appreciated!
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Posted by: Tim Lewis <timrv6a@earthlink.net>
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