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Mark,
You must be psychic, you reading my mind on the vapour and air bubbles.
I was thinking of making a fuel rail in an inverted ( but flatter) V shape
and having the by-pass at the apex. But in a bump in the line prior to the
rail is just as good and perhaps easier to install.
George ( down under)
I'm putting a bypass like that in the highest point of my fuel line
(between pump and rail) as I think it will also prevent, or at the very
least, alleviate, a vapor lock situation. A .030 or .040 jet will pass a
LOT of air/vapor but not enough fuel to impact anything.
Or that's my bet anyway ... Jim S.
Mark R Steitle wrote:
> George,
>
> That may have been me following Paul Conner’s first engine-out
> landing. I picked up the idea from the Eggenfellner Subaru group. They
> had had a couple of instances where pilots ran one tank dry and then
> couldn’t get the EFI pump to re-prime, and ended up in off-field
> landings. It is now a mandatory change for anyone running the
> Eggenfellner package. I used a small carburetor jet from my stash of
> 2-cycle motorcycle jets. It was about .020-025” and installed so as to
> bypass the pressure regulator, bleeding air back through the fuel
> return line. I have tested my setup and it allows enough pressure
> relief to permit the pump to re-prime if I run a tank dry. Before
> installing the bypass bleeder circuit, it would not re-prime unless I
> cracked open a line downstream of the pump.
>
> Mark S.
>
> ------------------------------------------------------------------------
>
> *From:* Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
> *On Behalf Of *Kelly Troyer
> *Sent:* Monday, June 13, 2005 8:23 PM
> *To:* Rotary motors in aircraft
> *Subject:* [FlyRotary] Re: Engine Not Starting
>
> Georges & George,
>
> I used a .020 thousands (.508 mm) !
>
> --
> Kelly Troyer
> Dyke Delta/13B/RD1C/EC2
>
>
> -------------- Original message from "George Lendich"
> <lendich@optusnet.com.au>: --------------
>
>
> Georges,
>
> Very small is my guess, someone on here gave that suggestion
> some time ago and I can't remember the size they suggested.
> It's just to relieve the pressure after shut down. The loss
> during running is so small as not to matter.
>
> I thought it was a great idea !
>
> George ( down under)
>
> What maximum size orifice would you use in the bypass hose?
>
> Georges B.
>
> /-------Original Message-------/
>
> */From:/* Rotary motors in aircraft
> <mailto:flyrotary@lancaironline.net>
>
> */Date:/* 06/13/05 15:50:42
>
> */To:/* Rotary motors in aircraft
> <mailto:flyrotary@lancaironline.net>
>
> */Subject:/* [FlyRotary] Re: Engine Not Starting
>
>> 3. Always stop the engine by turning off the fuel pump, so that
>
>> there is no fuel pressure in the line. Otherwise, unburned
> fuel may
>
>> leak from the still pressurized injectors into the rotors and
> increase
>
>> the chances of hard starting or flooding the next time you
> try to start
>
>> the engine.
>
> Bob,
>
> The suggested low volume by-pass hose ( by passing the fuel
> pressure
>
> regulator) will also solve that problem.
>
> George ( down under)
>
> .
>
>
>
>
>
>> Homepage: http://www.flyrotary.com/
>> Archive: http://lancaironline.net/lists/flyrotary/List.html
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