---------------------------------------------------------- JabiruEngine-List Digest Archive --- Total Messages Posted Wed 12/28/11: 1 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 02:35 AM - Re: [jabiruengines] fuel pressure with full throttle (James, Clive R) ________________________________ Message 1 _____________________________________ Time: 02:35:13 AM PST US Subject: JabiruEngine-List: RE: [jabiruengines] fuel pressure with full throttle From: "James, Clive R" That does sound quite low, the sensor should be between the engine fuel pump and the carby. 0.07mb is the square root of * all. Though if you can carry out a 5 min climb at full throttle without the electric pump then I would be happy. The other check to perform is a fuel flow check, this is stipulated by the UK LAA on an aircraft build and checks that your system has excess fuel when it's at full throttle. It is a good check to carry out though it is a bit of a fiddle to do. See the form at http://www.lightaircraftassociation.co.uk/engineering/StandardForms/LAA-I C-FF%20Fuel%20Flow%20Check%20Results.pdf And instructions at http://www.lightaircraftassociation.co.uk/engineering/TechnicalLeaflets/O perating%20An%20Aircraft/TL%202.20%20Fuel%20Flow%20Checking%20of%20Pumped %20Systems.pdf or follow the links on the left from the LAA website Fuel flow form is at http://www.lightaircraftassociation.co.uk then 'Forms/checklists' then under inspection, Fuel Flow (try clicking on this) And the Tech leaflet, instructions for carrying out the checks is at http://www.lightaircraftassociation.co.uk then 'technical leaflets' then under operating an aircraft, TL 2.20 (try clicking on this) Regards, Clive From: jabiruengines@yahoogroups.com [mailto:jabiruengines@yahoogroups.com] On Behalf Of jacques Bascou Sent: 27 December 2011 17:50 Subject: Re: [jabiruengines] fuel pressure with full throttle Thank's everyone... I had another fly today (it's winter in french...), flying over 2 hours. No problem of pressure. I just set the fuel pressure alarm at 0,07 mB. I don't really understand why fuel pressure goes down with little T=B0, and why when full throttle... I'm positive, thinking I have a lot of things to learn... Thank's for all responses... Le 27 d=E9c. 2011 =E0 17:01, jimpuglise@comcast.net a =E9crit : > I have had the same problem. It sometimes drops to < .75, which is the limit in the manual. However, I have never seen any signs of fuel starvation as a result of it. I e-mailed Pete about it and got a response from him asking where my fuel pressure gauge was in the line, so I assume that the placement of the sensor has some impact. Additionally, the opening in the engine installed pump is only 1/4 inch, so there is a little restriction built in. > > Jim Puglise > Europa, Jab 3300 > > ----- Original Message ----- > From: "Clive R James" > > To: jabiruengines@yahoogroups.com > Sent: Tuesday, December 27, 2011 6:00:39 AM > Subject: RE: [jabiruengines] fuel pressure with full throttle > > > > > > > Fuel pressure is a function of how much the fuel valve in the carby > (assuming you have one) is open. > > So at full throttle the pressure built up by the pump against an almost > fully open float valve will be low. > > It is an normal thing, set your TV screen up so it gives an alarm at > just below what the full flow reading is with only the engine pump. > > Go fly! > > Regards, Clive > > From: jabiruengines@yahoogroups.com > [mailto: jabiruengines@yahoogroups.com ] On Behalf Of jacques Bascou > Sent: 27 December 2011 09:48 > To: jabiruengines@yahoogroups.com > Subject: [jabiruengines] fuel pressure with full throttle > > Yesterday, I wanted to have a long fly. After taking off, I have gat a > fuel pressure alarm. > > After some check, I decided to land. > It looks that with full throttle, pressure goes down, and becomes good > again after reduicing throttle. No problem when using electric pump. I > never saw that because fuel pressure is not on principal screen on my > dynon. I cancelled my fly with a big disppointement. > > Is it a normal thing, or does I have a problem with my fuel pump? > > Merry christmas to eveyone!!! > > [Non-text portions of this message have been removed] > > > > > [Non-text portions of this message have been removed] > > > > ------------------------------------ > > Yahoo! Groups Links > > > __._,_.___ Reply to sender | Reply to group | Reply via web post | Start a New Topic Messages in this topic (17) Recent Activity: =B7 New Members 3 =B7 New Photos 3 Visit Your Group MARKETPLACE Stay on top of your group activity without leaving the page you're on - Get the Yahoo! Toolbar now. Yahoo! Groups Switch to: Text-Only , Daily Digest * Unsubscribe * Terms of Use .. __,_._,___ ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message jabiruengine-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/JabiruEngine-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/jabiruengine-list Browse Digests http://www.matronics.com/digest/jabiruengine-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.