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Kellym
Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ
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 Posted: Sat Jun 01, 2013 9:01 pm Post subject: Floscan location and Matronics fuel line pulsation damper |
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It is an unusual installation for a Lycoming fuel injected engine to
have a fuel return line. Bendix FI does not. AF has a purge line which
may or may not return to the tank, but is only used for shutdown, there
is no return when engine is running. Only Continental injection or
systems modeled after it have an active return line, and there are
sensors to account for that fuel, but not something that most RV-10
operations need to be concerned with.
On 6/1/2013 9:56 PM, ibspud(at)roadrunner.com wrote:
| Quote: |
Since, on injected engines, there is a fuel return line that goes from the pump back to the fuel selector valve, does the Floscan sender report higher flue flow than is actually used by the engine? Or is there only a small amount of fuel returned via that bypass route?
Albert Gardner
N991RV
Yuma, AZ
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Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
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robin(at)PaintTheWeb.com
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| Posted: Sat Jun 01, 2013 10:05 pm Post subject: Floscan location and Matronics fuel line pulsation damper |
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In the tunnel my cube absolutely reported more than consumed.
Robin
ibspud(at)roadrunner.com wrote:
Since, on injected engines, there is a fuel return line that goes from the pump back to the fuel selector valve, does the Floscan sender report higher flue flow than is actually used by the engine? Or is there only a small amount of fuel returned via that bypass route?
Albert Gardner
N991RV
Yuma, AZ
---- Pascal <rv10flyer(at)live.com> wrote:
[quote]
The flip side is Dynon does tell one (pg7-41) "It is common to place the
sender downstream of any auxiliary electric boost pumps but upstream of the
engine driven fuel pump." as does Vans. I think they need to consult Floscan
on getting that perception updated!! I am usually less than .3 off at
fillups, could be user error as well since I say 60 gallons and there may be
59.X, but it is pretty consistent and minor.
My point is that it works just fine for me in the tunnel. It probably is
easier to install in the spider/ servo area as the tunnel setup was a bear
for me from the boost pump, but it works and I don’t see a need to move it..
With all that said- If I was doing this again- I would seriously consider
putting it up front by the servo/spider.
--
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rleffler
Joined: 05 Nov 2006
Posts: 680
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| Posted: Sun Jun 02, 2013 2:08 am Post subject: Floscan location and Matronics fuel line pulsation damper |
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Just to add some additional clarification to what Kelly stated. With the AFP purge valve in addition to cutting off the fuel feed for shutdown, it also functions to flush warm fuel with cold to aid in hot starts.
I am also aware of one RV-10 with a Bendix that added a AFP purge valve.
I suspect when you flush the fuel it will cause the EFIS to report more fuel consumed than actually used, but it really isn't a significant amount.
Sent from my iPad
On Jun 2, 2013, at 1:01 AM, Kelly McMullen <kellym(at)aviating.com> wrote:
| Quote: |
It is an unusual installation for a Lycoming fuel injected engine to have a fuel return line. Bendix FI does not. AF has a purge line which may or may not return to the tank, but is only used for shutdown, there is no return when engine is running. Only Continental injection or systems modeled after it have an active return line, and there are sensors to account for that fuel, but not something that most RV-10 operations need to be concerned with.
On 6/1/2013 9:56 PM, ibspud(at)roadrunner.com wrote:
>
>
> Since, on injected engines, there is a fuel return line that goes from the pump back to the fuel selector valve, does the Floscan sender report higher flue flow than is actually used by the engine? Or is there only a small amount of fuel returned via that bypass route?
> Albert Gardner
> N991RV
> Yuma, AZ
-----
No virus found in this message.
Checked by AVG - www.avg.com
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Bob Leffler
N410BL - Phase I
http://mykitlog.com/rleffler |
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