---------------------------------------------------------- Europa-List Digest Archive --- Total Messages Posted Wed 12/12/07: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 01:48 AM - Re: Secondary Fuel Pump, correct or not (josok) 2. 11:34 AM - Re: Secondary Fuel Pump, correct or not () 3. 11:34 AM - Scandi fly-in (josok) ________________________________ Message 1 _____________________________________ Time: 01:48:00 AM PST US Subject: Re: Europa-List: Secondary Fuel Pump, correct or not From: "josok" Ron, Obvious mistake: I should have said liters per hour, not minutes. The fuel flow test does not test the flow to the engine, it tests the total flow out of the tank. While it is a good indication of the condition of filters and pumps, it does not test the fuel pressure regulator. For fuel pressure over air box i have the UMA sensor. Based on a few years of reading of accident reports and forums, i think that this total flow check before take-off would have grabbed almost all of the fuel starvation mishaps caused by clogged restrainers, filters and rotten fuel lines. If there has been any mishap with the fuel pressure regulator, i have missed it. Leaking connections i have had, both a damaged o-ring on the gascolator, and a poor flange on the alu pipe near the fuel selector. While these caused a hell of a smell, and some fuel under the plane, the fuel test was still over 120 liters, and over 135 liters with 2 pumps on. Those numbers are based on my "clean" system, to have a repeatable test. Different systems will produce different throughput, and also the battery condition is a factor. Regards, Jos Okhuijsen Visit - www.EuropaOwners.org ________________________________ Message 2 _____________________________________ Time: 11:34:56 AM PST US Subject: Re: Europa-List: Secondary Fuel Pump, correct or not From: Hi Jos "over 120 liters, and over 135 liters with 2 pumps on." This is probably very close to what I tested. I have a UMA differential gauge, and a UMA fuel flow gauge. I asked Ed if he could give me a switch to read just outgoing sender on my analogue display, but was not cost feasible. I think you have a nice feature being able to read total flow one pump at a time and both pumps. To make total flow number mean more, you could do a couple of tests: Go to full power on 1 pump, then turn off fuel selector, a little bit at a time till you see differential pressure needle begin to go down, and below 2PSI and note your fuel flow. Would be nice to see difference between lower and higher altitude. If you don't mind sharing these results it would be greatly appreciated. The fuel pressure regulator has a built in restriction. You need to meet the required flow rate that will create enough pressure because of this restriction to crack open the regulator and allow fuel to flow into the carb float bowls. Each system will be slightly different due to execution of system. You have the opportunity to learn what this flow rate is at various altitudes (thin air, high boost most flow rate will be needed because motor is gobbling up some flow, and you need higher regulator pressure when boosting and since you are trying to overcome airbox pressure that is absolute, when ambient pressure lowers, you need more regulator pressure compared to higher ambient pressure). Ron Parigoris ________________________________ Message 3 _____________________________________ Time: 11:34:56 AM PST US Subject: Europa-List: Scandi fly-in From: "josok" Stefan Ingemarsson asked me to post this invitation for the Swedish Europa fly-in on the forum. The event will take place the 27-29 of June 2008 at Skvde ESGR 5827'22'' N 1358'22'' E 6 NM/11 KM NE Skvde k:a See attached file (hope it will be copied to the Matronics list) Regards, Jos Okhuijsen Visit - www.EuropaOwners.org Attachments: http://www.europaowners.org//zfiles/europa_nordic_fly-in_2008_728.pdf ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message europa-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Europa-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/europa-list Browse Digests http://www.matronics.com/digest/europa-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.