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Date: Thu, 10 May 2007 11:25:27 -0400
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Subject: Re: [LML] Re: IO-550 fuel injection
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From: "John Schroeder" <jschroeder@perigee.net>
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Rick -

Remind me to hire you for any kind of troubleshooting on our airplane. Excellent and thoughtful listing of hypotheses/checklist items for Eugene, and all of us to look into.

Cheers,

John


On Thu, 10 May 2007 09:51:27 -0400, rtitsworth <rtitsworth@mindspring.com> wrote:

> Eugene,
>
> First a couple silly thoughts (which don't seem to apply since it
> mysteriously now works again), but seemed like potential learning
> opportunities (for me anyway).
>
> 1. Does anyone know the failure modes of the electric boost pump?  I
> know/believe it is a free flow design but if it's impeller/diaphragm (???)
> fails "could' it cause a restriction?
>
> 1b. How does the Dukes pump work?  Anyone have an exploded view diagram for
> future reference?
>
> 2. What is the behavior of a plugged (or partially plugged) gas collator?
> Is it a potential restriction?
>
> 3. Is your collator drain easily accessible?  Do you drain/sump it every
> flight?  Ever get any H20 from it?  Do you disassemble/inspect it at annual
> CI?
>
>
> A couple other questions;
>
> 4. Does your wing tip fuel vent line make a vertical turn before going to
> the tank (so water would have to go uphill).
>
> 5. Were your fuel tanks both full (maximum gravitational head pressure)?  If
> not, any chance for similar high h20 condensation on the inside - partially
> restricting the gas collator?
>
> 6. What was the approx temp on the ground?  (I'm assuming it wasn't too hot
> yet at 8:30am)  Any idea of the temp enroute?  (I'm assuming no bizarre
> atmospheric phenomenon, and 8500 doesn't seem all that high anyway from a
> fuel vaporization standpoint).  Also assuming normal 100LL fuel.
>
> 7. What were your approximate cruise power settings and fuel flow at the
> time (assuming 25"ish MP, 2400/2500'ish RPM and less than 20 GHP?
>
> 8. Do you have the original ES fuel-line set-up (sharp 90' fittings at the
> tanks, flex line to the fuselage wall, sharp 90' bulkhead fittings, 3/8"
> hard line to the selector (Andair), more sharp 90' fittings at the selector,
> 3/8" line to the boost pump (Dukes) and to the collator (old Lancair style
> vs Andair collator).
>
> 9. Where is you boost pump located and how is it oriented? (assuming it's in
> the cabin, on the lower firewall, oriented vertically)
>
> 10. When the pressure/flow when to zero, did the engine stumble/quit?
> (trying to rule out any sort of engine monitor/gauge error)
>
> 11. Assuming nothing else unique/abnormal about the flight (gross weight,
> other???)
>
> 12. Really bizarre thought... Could a restriction in the engine fuel pump
> vapor return line cause it to stop flowing and leave the engine pump
> cavitating (not able to prime)?   Does anyone know approx how much
> fuel/vapor cycles back through that circuit (under normal conditions)?
>
> Rick
>
>
> -----Original Message-----
> From: On Behalf Of glong2
> Subject: [LML] Re: IO-550 fuel injection
>
> I would like to share an experience I had with what I believe is a fuel line
> vent problem on my ES.
>
>
>
> --
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