---------------------------------------------------------- RV-List Digest Archive --- Total Messages Posted Thu 11/04/10: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 06:40 AM - Re: AFP and fuel pressure and fuel pump (Richard Martin) 2. 09:06 AM - AFP and fuel pressure and fuel pump (George Inman) ________________________________ Message 1 _____________________________________ Time: 06:40:12 AM PST US Subject: Re: RV-List: AFP and fuel pressure and fuel pump From: Richard Martin I have experienced 5 or 6 fuel pumps during the 2000 hours that I have on my RV8. They usually last 400 or 500 hours, however, I just replaced one (they warrantied it) that failed in less than 25 hours. I have an IO390 lyc engine . I also use a Airflow Performance electric standby fuel pump. The standby pumps usually last indefinetly. Good Luck Dick Martin RV8 N233M the fast one On Wed, Nov 3, 2010 at 11:17 AM, wrote: > Tom, > > > I occasionally experience the same problem, but it seems to be related to > having full tanks -- perhaps the fuel vent line is full of fuel causing the > pump to work harder. If I switch tanks, the pressure returns to 25psig. > Again, it only happens with full tanks and usually lasts no longer than a > minute or so...been that way since first flight almost 800 hours ago. > > > Best I, > > > Bill > > RV-7 N151WP > > Lees Summit, MO > > > ----- Original Message ----- > From: "thomas sargent" > To: "rv-list" > Sent: Wednesday, November 3, 2010 10:43:43 AM > Subject: RV-List: AFP and fuel pressure and fuel pump > > I have the AFP fuel injection unit on my RV-6A and a VM-1000 to monitor the > fuel pressure. When I first started flying it (about 15 hours ago) the fuel > pressure read about 26 psi running on the engine driven pump and would go to > 27 when I switched on the boost pump. The pressure produced by the engine's > pump has slowy been decreasing. It now shows about 24psi and even 23psi > once. Turning on the boost pump always brings it back to the 26 - 27 range > (after a brief surge up to 35 or so). The engine seems to run OK either > way. > > So, I think the pressure sensor is OK. Is it normal for a fuel pump to sag > a little in the first 15 hours of operation, or do I have a nascent problem > on my hands? > > Does any one know the miinimum fuel pressure that AFP needs? > > Thanks, > > -- > Tom Sargent, RV-6A > > * > > _blank>www.aeroelectric.com > /" target=_blank>www.buildersbooks.com > =_blank>www.homebuilthelp.com > blank>http://www.matronics.com/contribution > t=_blank>http://www.matronics.com/Navigator?RV-List > p://forums.matronics.com* > > * > > ________________________________ Message 2 _____________________________________ Time: 09:06:11 AM PST US From: George Inman Subject: RV-List: AFP and fuel pressure and fuel pump I have a Bendix FI on my O360 In flight fuel pressure is about 24 with boost off about 27 with boost on If I am slow taxiing with a warm engine it drops to about 17 -- George H. Inman ghinman@mts.net ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rv-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/RV-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/rv-list Browse Digests http://www.matronics.com/digest/rv-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.