flyrotary@lancaironline.net Mailing List Archive

Mark,

Thanks Mate!

I don't know how often you chaps might run a tank dry ( I never have personally) but statistically it may have a high probability and there is always that chance no matter how well you plan your trip. So it looks to me to be a significant safety issue and not just pressure release from idle fuel injectors.

Going by Al Wicks doctrine, a by-pass would be mandatory.

I'm wondering if we can start a list of best practices, if not already started (I believe this is done on other discussion groups) and add this modification to that list.

MO - FWIW

George ( down under)

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

Date: 06/13/05 15:50:42

To: Rotary motors in aircraft

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)

.