---------------------------------------------------------- Europa-List Digest Archive --- Total Messages Posted Fri 02/24/06: 8 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 01:12 AM - Re: Re: Fuel pumps in series can get blocked (BEBERRY@aol.com) 2. 06:45 AM - Re: Re: Fuel pumps in series can get blocked (Paul McAllister) 3. 07:27 AM - Re: Re: AW: Re: 914 Fuel System (RK Hallett III) 4. 07:29 AM - Re: Re: Fuel pumps in series can get blocked (RK Hallett III) 5. 08:29 AM - Re: Fuel pumps in series can get blocked (europa flugzeug fabrik) 6. 09:15 AM - Re: Re: Fuel pumps in series can get blocked (Paul McAllister) 7. 09:36 AM - Re: Re: Fuel pumps in series can get blocked () 8. 10:42 AM - UK - trailer for Classic mono wanted. (Pete Lawless) ________________________________ Message 1 _____________________________________ Time: 01:12:30 AM PST US From: BEBERRY@aol.com Subject: Re: Europa-List: Re: Fuel pumps in series can get blocked --> Europa-List message posted by: BEBERRY@aol.com I am really learning about fuel pumps and pressures etc (I think) and wonder if anyone can comment on the problem I have with getting a smooth running engine at RPM below about 3600 on my 914. Could it be overmuch fuel pressure and carb flooding with both pumps on in my parallel system? On the other hand when doing test engine ground runs I have the pumps, filters etc in view and there is always only one pump fully working as witness the amount of fuel flowing through the transparent filter barrels.. Going back to some recent discussions on filters and accumulation of grot. A good while ago I removed a huge amount of stuff from my carbs and jets, none of which had been trapped by the filters which were as clean as a whistle. With my briefish experience of the Rotax I find this curious. Patrick ________________________________ Message 2 _____________________________________ Time: 06:45:54 AM PST US From: "Paul McAllister" Subject: RE: Europa-List: Re: Fuel pumps in series can get blocked --> Europa-List message posted by: "Paul McAllister" Fred, The standard Europa design has the fuel return coming in at the bottom of the tank. I made my system return the fuel into the top of the tank via a 1/4" aluminum line. I found in my setup with parallel pumps that I did not did not exceed the maximum return fuel pressure as specified by Rotax. Paul ________________________________ Message 3 _____________________________________ Time: 07:27:42 AM PST US From: RK Hallett III Subject: Re: Europa-List: Re: AW: RE: 914 Fuel System --> Europa-List message posted by: RK Hallett III Actually Dave sent me a picture of South Lake Tahoe, taken from his MG while at more than 20,000 feet. Dave isn't following this site any longer, but I can fwd questions on to him if you like. Ralph RK Hallett III Reno,NV Vaughn & Gaye Teegarden wrote: > --> Europa-List message posted by: "Vaughn & Gaye Teegarden" > > Dan > > "If not, do you know of anyone that is flying at these high altitudes with > the 914 and what configuration they are using?" > > > Dave Anderson is flying his XS 914 with glider at 17,000'. He used to have a > web page with his build log, but I haven't looked for it lately so I will > have to. Formerly it could be accessed from the Europa site somehow. > > Vaughn Teegarden > ============================================================ > >> >> >> >> >> >> >> >> >> > > > > > > > > ________________________________ Message 4 _____________________________________ Time: 07:29:18 AM PST US From: RK Hallett III Subject: Re: Europa-List: Re: Fuel pumps in series can get blocked --> Europa-List message posted by: RK Hallett III Paul, Makes perfect sense. This way you aren't returning back against the hydrostatic pressure of all the fuel in the tank. Ralph RK Hallett III Reno,NV Paul McAllister wrote: > --> Europa-List message posted by: "Paul McAllister" > > Fred, > > The standard Europa design has the fuel return coming in at the bottom of > the tank. I made my system return the fuel into the top of the tank via a > 1/4" aluminum line. I found in my setup with parallel pumps that I did not > did not exceed the maximum return fuel pressure as specified by Rotax. > > Paul > > > > > > > > ________________________________ Message 5 _____________________________________ Time: 08:29:19 AM PST US Subject: Europa-List: Re: Fuel pumps in series can get blocked From: "europa flugzeug fabrik" --> Europa-List message posted by: "europa flugzeug fabrik" n100rh(at)sbcglobal.net wrote: > Makes perfect sense. This way you aren't returning back against the hydrostatic pressure of all the fuel in the tank. If the return line still runs along the floor, I was assuming that the head pressure would be identical -- full tank vs. upward push in the return line. Partial tank; we're in the hole. However, I can just about remember what my Physics 101 prof looked like! Whatever works, though, I always say. Best would be the routing return line back along the fuselage side, thence to tank top. That one I'm pretty sure of... [Wink] Reg, Fred F.. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=14666#14666 ________________________________ Message 6 _____________________________________ Time: 09:15:25 AM PST US From: "Paul McAllister" Subject: RE: Europa-List: Re: Fuel pumps in series can get blocked --> Europa-List message posted by: "Paul McAllister" Fred, Mine runs through the firewall along the side of the fuselage under the window still and into the tank. It never gets to run uphill. Paul ________________________________ Message 7 _____________________________________ Time: 09:36:28 AM PST US Subject: Re: Europa-List: Re: Fuel pumps in series can get blocked From: --> Europa-List message posted by: Quick note on parallel vs series. In parallel, if 1 pump destroys itself, and some debris jams the 1 way valve in the pump opened, the other pump, although may be perfectly functional may not create enough pressure to prevent the playing of silent night. Has anyone actual had a pump 1 way fail opened? Like someone mentioned a Andair or similar 1 way in series with each pump output could help with both pumps, or one 1 way not allowing back feed from the aux pump back through main. Not going to help the excess pressure though. One thing I noticed on my build is that all fittings are not created equal. Some have smaller internal holes than other. This for certain can cause restriction on 914s where flow rates can be 40gph plus. I chose fittings or bored so restriction held to minimum. Paul it would be interesting to see if your lack of a too high differential fuel pressure with both pumps on are in fact because of not returning to bottom of tank, or because of lack of restriction in return line?? The thicker the air, the greater the return pressure should be. Ron Parigoris ________________________________ Message 8 _____________________________________ Time: 10:42:43 AM PST US From: "Pete Lawless" Subject: Europa-List: UK - trailer for Classic mono wanted. --> Europa-List message posted by: "Pete Lawless" Hi All I am looking to buy a second hand factory, or similar, trailer for my Europa Classic monowheel. I have just sold my Schofield trailer as the aeroplane is hangered, but do feel the need to have a trailer available to move the aeroplane by road should it be necessary. Please contact me off Forum with age and price Thanks Pete Lawless