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Albert Gardner
Joined: 10 Jan 2006
Posts: 455
Location: Yuma, AZ
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 Posted: Sun Jun 02, 2013 9:02 am Post subject: Floscan location and Matronics fuel line pulsation dampe |
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I was referring to the return loop on the Airflow Performance pumps that goes from the pump manifold back to a T fitting at the fuel selector valve input. My calculated fuel consumption agrees closely with actual consumption so it appears there is little recirculated fuel involved. Just wondering what the return loop's function is?
Albert Gardner
N991RV
Yuma, AZ
---- 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
>
>
>
-----
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RV-9A N872RV
RV-10 N991RV |
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Bob Turner
Joined: 03 Jan 2009
Posts: 885
Location: Castro Valley, CA
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| Posted: Sun Jun 02, 2013 12:12 pm Post subject: Re: Floscan location and Matronics fuel line pulsation d |
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The return line helps set the fuel pressure. There is a check valve, and it relieves excess pressure by sending some fuel back to the pump's inlet side. So some fuel goes round and round, but not back to the tank. If your flowscan was between the return T and the pump you would read high, but anywhere else should be okay.
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http://www.matronics.com/Navigator?RV10-List |
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Bob Turner
RV-10 QB |
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