Today's Message Index:
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1. 12:26 PM - Re: High fuel pressure warning (FLYaDIVE)
2. 02:24 PM - Re: High fuel pressure warning (Ralph E. Capen)
Message 1
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| Subject: | Re: High fuel pressure warning |
Ralph:
There are a few issues that can cause this type of result.
1 - Restricted fuel line.
2 - Bad transducer.
3 - Improper setting in the program. Yes I read what you said just
REMOVE the old setting and reset it, don't just LQQK at it, re-set it.
4 - Clogged filters.
5 - Clogged / Restricted Injectors. Remove, Clean in Hoppies #9 and
reinstall. OH! Do you have GAMI Injectors? If so make sure you put
them back in the same cylinder.
6 - FUZZ floating around in the fuel distribution system. I mention
this because I had a strange problem that would come and go in a
second. It took a LONG time to find the problem since I cleaned the
system at least 4 times... A STINKING PIECE OF FUZZ!!! It would ONLY
come out and block an injector for a few seconds and then disappear.
I don't know where it was hiding but it showed up and caused all sorts
of problems.
7 - Question - Problem: Do you see the high pressure when you shut
off the BOOST PUMP?
8 - Question - Problem: Do you have a RETURN line going back to the fuel tank?
Story: I had the SAME high pressure reading on a friends plane
(RV7A)... Every-time he turned on the BOOST PUMP the warning would
sound and light would come on. As a precaution and since we were
working on the Conditional Inspection we changed the Inline Fuel
Filters coming out of each wing. When I did I found BOTH aluminum
fuel lines to be crimped down. I cut off the crimped ends and
installed a longer rubber tube to the inline fuel filters. Problem
Solved.
Barry
On Mon, Mar 13, 2017 at 10:40 AM, Ralph E. Capen <recapen@earthlink.net> 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!
>
>
Message 2
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| Subject: | High fuel pressure warning |
Barry,
Good stuff to check...
I have already done 2 (replaced transducer): I did 3, 4, and 5
7 - with or without boost pump - I get the warning
8 - I have a return line - but it is only used during purge operation (I have AFP
injection)
Looking @ #6 seriously now!
Fleew again today - no issues after resetting (per #3) - it started with 46 PSI
before engine start....causing me to reset it....
Really looking @ #6!
Thanks,
Ralph
-----Original Message-----
From: owner-lycomingengines-list-server@matronics.com [mailto:owner-lycomingengines-list-server@matronics.com] On Behalf Of FLYaDIVE
Sent: Saturday, March 18, 2017 3:25 PM
Subject: Re: LycomingEngines-List: High fuel pressure warning
--> <flyadive@gmail.com>
Ralph:
There are a few issues that can cause this type of result.
1 - Restricted fuel line.
2 - Bad transducer.
3 - Improper setting in the program. Yes I read what you said just REMOVE the
old setting and reset it, don't just LQQK at it, re-set it.
4 - Clogged filters.
5 - Clogged / Restricted Injectors. Remove, Clean in Hoppies #9 and reinstall.
OH! Do you have GAMI Injectors? If so make sure you put them back in the same
cylinder.
6 - FUZZ floating around in the fuel distribution system. I mention this because
I had a strange problem that would come and go in a second. It took a LONG
time to find the problem since I cleaned the system at least 4 times... A STINKING
PIECE OF FUZZ!!! It would ONLY come out and block an injector for a few
seconds and then disappear.
I don't know where it was hiding but it showed up and caused all sorts of problems.
7 - Question - Problem: Do you see the high pressure when you shut off the BOOST
PUMP?
8 - Question - Problem: Do you have a RETURN line going back to the fuel tank?
Story: I had the SAME high pressure reading on a friends plane (RV7A)... Every-time
he turned on the BOOST PUMP the warning would sound and light would come
on. As a precaution and since we were working on the Conditional Inspection
we changed the Inline Fuel Filters coming out of each wing. When I did I found
BOTH aluminum fuel lines to be crimped down. I cut off the crimped ends and
installed a longer rubber tube to the inline fuel filters. Problem Solved.
Barry
On Mon, Mar 13, 2017 at 10:40 AM, Ralph E. Capen <recapen@earthlink.net> wrote:
> --> <recapen@earthlink.net>
>
> 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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