---------------------------------------------------------- RotaxEngines-List Digest Archive --- Total Messages Posted Mon 07/20/15: 4 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:55 AM - Vapor lock 914 (Peter Thomson) 2. 06:34 AM - Re: Vapor lock 914 (davidjoyce@doctors.org.uk) 3. 08:50 AM - Re: Vapor lock 914 (rampil) 4. 09:53 AM - Re: Vapor lock 914 (Roger Lee) ________________________________ Message 1 _____________________________________ Time: 05:55:40 AM PST US Subject: RotaxEngines-List: Vapor lock 914 From: Peter Thomson Friend has been having problems with "vapor lock" particularly at take off power. Aircraft is Pelican, high wing, L and R wing tanks feeding through a L-Both-R-OFF selector to a gascolator, then through two Facet pumps in series to carburetors, with airbox. Return line is T-eed back to the gascolator. Most lines fire-sleeved. Could the problem be fixed by taking the fuel return back to a wing tank ? ________________________________ Message 2 _____________________________________ Time: 06:34:57 AM PST US From: davidjoyce@doctors.org.uk Subject: Re: RotaxEngines-List: Vapor lock 914 For what it is worth, the LAA approved arrangement for the 914 in a Europa takes the return line back to the main tank situated in the fuselage. There is substantial return flow which means that you are getting rapid supply as far as the pressure relief valve of fuel at the (hopefully low) temperature of the main tank. In >1000hrs flying this arrangement in often very hot conditions, have never had serious vapour lock problems. Regards , David Joyce On 2015-07-20 13:54, Peter Thomson wrote: > Friend has been having problems with "vapor lock" particularly at take off power. > > Aircraft is Pelican, high wing, L and R wing tanks feeding through a L-Both-R-OFF selector to a gascolator, then through two Facet pumps in series to carburetors, with airbox. Return line is T-eed back to the gascolator. Most lines fire-sleeved. > > Could the problem be fixed by taking the fuel return back to a wing tank ? > Links: ------ [1] http://www.matronics.com/Navigator?RotaxEngines-List [2] http://forums.matronics.com [3] http://www.matronics.com/contribution ________________________________ Message 3 _____________________________________ Time: 08:50:20 AM PST US Subject: RotaxEngines-List: Re: Vapor lock 914 From: "rampil" Is the gascolator forward of the firewall (like cessnas) or in the fuselage (like old pipers or my Europa)? Location and temperature make a difference. -------- Ira N224XS Read this topic online here: http://forums.matronics.com/viewtopic.php?p=444976#444976 ________________________________ Message 4 _____________________________________ Time: 09:53:16 AM PST US Subject: RotaxEngines-List: Re: Vapor lock 914 From: "Roger Lee" Why does he think it is vapor lock? It could be something different especially at take off when things haven't had a good opportunity to get really hot. Why couldn't it be fuel starvation? All the Flight Design's have their recirculation line go back into the gascolator which is in the lower part of the engine compartment. None of them anywhere has ever had an issue. There is plenty of cool fuel moving through here to prevent vapor lock. If your gascolator were to be to near a heat source then it could be affected. Depending on which of his fuel lines are not fire sleeved then maybe this may contribute. You can plumb the recirculation line back to a header tank, the wing or the gascolator and all are acceptable. -------- Roger Lee Tucson, Az. Rotax Instructor & Rotax IRC Light Sport Repairman Home 520-574-1080 TRY HOME FIRST Cell 520-349-7056 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=444985#444985 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rotaxengines-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/RotaxEngines-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/rotaxengines-list Browse Digests http://www.matronics.com/digest/rotaxengines-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.