I just put on the new hose and I did use a small orifice in the fitting. Vans sells one with a .040" orifice for both oil and fuel pressure use. It is just a modified AN fitting with an aluminum plug with a small hole in it. I just finished making one on my lathe. For fuel pressure it is still very fast reacting.
-------- Original Message -------- Subject: Re: KR> broken fuel line and lessons learned From: "John Martindale" <john_martindale at bigpond.com> List-Post: krnet@list.krnet.org Date: Thu, July 25, 2013 11:13 pm To: "'KRnet'" <krnet at list.krnet.org> Hi Larry The PMA nipple where that line attaches to the engine block should have a very small orifice (pin holes size) to minimise oil loss in the event of a breakage you describe. The theory is that the pressure, being equal in a system, is still transmitted. Trouble is when the oil is cold this can take some time and your gauge is slow to register on start up when you really want to know quickly that pressure is there. Sometimes a light machine oil is put in the tube after the hole and provided it can't run out, that is, the tube goes downhill to the gauge, the time lag can be reduced. Sometimes the orifice nipple is mistakenly replaced with a normal nipple and then oil just pisses out...... head for the nearest strip quick :-). John Martindale 29 Jane Circuit Toormina NSW 2452 Australia ph:61 2 6658 4767 m:0403 432179 email:john_martindale at bigpond.com web site: http://john-martindale-kr2.zxq.net -----Original Message----- From: KRnet [mailto:krnet-bounces at list.krnet.org] On Behalf Of Larry Howell Sent: Friday, 26 July 2013 2:28 PM To: KRnet Subject: Re: KR> broken fuel line and lessons learned "Jeff Scott" <jscott.planes at gmx.com> wrote: > I thought I would look that up in AC43.13. It says surprisingly little about the fuel lines them selves, so now I'm wondering where it is that I learned that so many years ago? > > > > I remember a small copper line from my engine going to the oil pressure gauge in my FAA certified factory built Mooney breaking and spewing oil onto a friends legs just before we departed my airport years ago that caused us to miss a day of flying. If I'm not mistaken I think I remember similar fuel pressure lines in some of the other factory planes I have owned! I might be mistaken about the fuel lines though. > Larry H > _______________________________________________ Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org please see other KRnet info at http://www.krnet.org/info.html see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change options ----- No virus found in this message. Checked by AVG - www.avg.com Version: 2013.0.3349 / Virus Database: 3209/6521 - Release Date: 07/25/13 _______________________________________________ Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org please see other KRnet info at http://www.krnet.org/info.html see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change options
